CN103684152A

CN103684152A - Stepping motor control circuit, movement, and analog electronic timepiece

Info

Publication number: CN103684152A
Application number: CN201310404120.3A
Authority: CN
Inventors: 间中三郎; 小笠原健治; 佐久本和实; 本村京志; 山本幸祐; 酒井聪
Original assignee: Seiko Instruments Inc
Current assignee: Seiko Instruments Inc
Priority date: 2012-09-07
Filing date: 2013-09-06
Publication date: 2014-03-26
Anticipated expiration: 2033-09-06
Also published as: CN103684152B; US9190941B2; JP6162513B2; US20140071795A1; JP2014066698A

Abstract

A stepping motor control circuit, a movement, and an analog electronic timepiece are disclosed. The invention aims to carry out precise rotation detection while reducing the influence of load change. A rotation detection circuit detects an induced current flowing through a drive coil of a stepping motor in a detection section divided into a plurality of sections (T1-T3), and detects a rotation state of the stepping motor on the basis of a pattern indicating whether or not the induced current exceeds a predetermined reference value in each of the sections (T1-T3). A control unit selects a drive pulse (P10-P1m, P2) corresponding to the rotation state detected by the rotation detection unit, and supplies a drive current to a drive coil to rotatably drive the stepping motor. The rotation detection unit carries out detection by selecting a detection direction of the induced current in the sections (T1-T3) after the first section (T1) on the basis of whether or not the induced current exceeding each of a plurality of reference values is detected plural times in the first section.

Description

Stepping motor control circuit, movement and analog electronic clock

Technical field

The analog electronic clock that the present invention relates to stepping motor control circuit, there is the movement of above-mentioned stepping motor control circuit and adopt above-mentioned movement.

Background technology

All the time, use stepping motor in analog electronic clock etc., this stepping motor possesses: stator, and it has rotor and accommodates with through hole and a plurality of location divisions of determining the stable resting position of rotor; Being provided in above-mentioned rotor accommodates with the rotor in through hole; Be wrapped in the drive coil in said stator.For above-mentioned stepping motor is rotated more reliably, be rotated detection, carry out driving accordingly (for example,, with reference to patent documentation 1～4) with rotation testing result.

The rotation detection mode that

patent documentation

1,2 is recorded is configured to be had: detect between the 1st detection zone of the rotor motion state after driving pulse disconnects; And for according to result, carry out final rotation judge detect and the 1st detection zone between between the 2nd detection zone of reciprocal induced signal.The rotation of carrying out thus stepping motor detects, and utilizes with the corresponding driving pulse of rotation testing result and is rotated driving.

Although utilize this structure can be rotated detection, have such problem: when load change (calendar load, compared with the load of large needle moment) is larger, induced signal produces change, is difficult to rotate accurately detection.

On the other hand, rotation detection mode described in patent documentation 3 is configured to, utilizing after main driving pulse P11 makes rotor, when the detection voltage of induced signal is during lower than reference voltage V comp, utilize corrected drive pulse P2 to drive, next main driving pulse P1 change (pulse rising) drives for the large main driving pulse P12 of the main driving pulse P11 of energy Ratios, in addition, in the situation that the detection detecting while utilizing main driving pulse P12 to carry out rotation is constantly Zao than fiducial time, from main driving pulse P12 pulse, drop to main driving pulse P11, utilize suitable main driving pulse P1 to drive.

But, because be, utilized along with the relative load with respect to driving-energy increases, the detection of induced signal postpones constantly and the rotation detection mode of the situation that the level of above-mentioned induced signal reduces, so when producing to a certain degree above load change (calendar load, compared with the load of large needle moment), the angular speed of rotor reduces, although rotate, induced signal also reduces.Therefore, existing rotation error detection is the non-rotating problem of utilizing corrected drive pulse to drive.As a result, there is the problem that current sinking increases, battery life reduces.

In addition, rotation detection mode described in patent documentation 4 utilizes the detection of induced signal to be constantly accompanied by load increase and the situation of delay, and utilized the pattern of the induced signal VRs in the interval being divided between detection zone behind a plurality of intervals according to the rotary state of stepping motor and different situations, but same with the invention described in patent documentation 3, existence may be carried out the problem that wrong rotation detection increases power consumption due to the impact of load change.

Patent documentation 1: No. 3302804 communique of Japan Patent

Patent documentation 2: No. 4165092 communique of Japan Patent

Patent documentation 3: Japan internationality discloses No. 2005/119377

Patent documentation 4: TOHKEMY 2010-166798 communique

Summary of the invention

The present invention puts in view of the above problems and completes, and its problem is to reduce the impact of load change and rotate accurately detection.

According to the 1st aspect of the present invention, following stepping motor control circuit is provided, it is characterized in that possessing: rotation test section, it detects the induced current that flows through drive coil due to the free vibration of stepping motor in being divided between the detection zone in a plurality of intervals, utilization is along with the relative load with respect to driving-energy increases, the described faradic situation that constantly produces delay and described faradic level reduction that detects, according to being illustrated in described each interval the faradic pattern over pre-determined reference value whether detected, detect the rotary state of described stepping motor, and control part, it selects driving pulse corresponding to rotary state detecting with described rotation test section from the mutually different multiple driving pulse of energy, utilize the driving pulse of described selection to provide drive current to described drive coil, described stepping motor is rotated to driving, described rotation test section is according to the induced current over pre-determined reference value whether being detected in initial the 1st interval interval of the conduct between described detection zone, in interval the described the 1st after interval, select faradic detection side to and detect, according to the described faradic pattern based on detecting in described each interval, detect the rotary state of described stepping motor.

According to the 2nd aspect of the present invention, following stepping motor control circuit is provided, it is characterized in that possessing: rotation test section, it detects the induced current that flows through drive coil due to the free vibration of stepping motor in being divided between the detection zone in a plurality of intervals, utilization is along with the relative load with respect to driving-energy increases, the described faradic situation that constantly produces delay and described faradic level reduction that detects, according to being illustrated in described each interval the faradic pattern over pre-determined reference value whether detected, detect the rotary state of described stepping motor, and control part, it selects driving pulse corresponding to rotary state detecting with described rotation test section from the mutually different multiple driving pulse of energy, utilize the driving pulse of described selection to provide drive current to described drive coil, described stepping motor is rotated to driving, described rotation test section has described drive coil is flow through in detection each other in reverse direction faradic the 1st detecting element due to the free vibration of described stepping motor, the 2nd detecting element, and between described detection zone, by the drive coil that makes to comprise described stepping motor and the 1st closed circuit of described detecting element and the 2nd closed circuit being formed by described drive coil and low impedance element, repeatedly replace to detect described induced current, according to using described the 1st detecting element in initial the 1st interval interval of the conduct between described detection zone, the 2nd detecting element detects described induced current and the result that obtains, be selected in the detecting element using in the described the 1st interval interval afterwards and detect, according to the described faradic pattern based on detecting in described each interval, detect the rotary state of described stepping motor.

In addition, according to the 3rd aspect of the present invention, provide a kind of movement, it is characterized in that having above-mentioned stepping motor control circuit.

In addition, according to the 4th aspect of the present invention, provide a kind of analog electronic clock, it is characterized in that having above-mentioned movement.

Invention effect

According to stepping motor control circuit of the present invention, can reduce the impact of load change and rotate accurately detection.

According to movement of the present invention, can form the impact that can reduce load change and rotate accurately the analog electronic clock of detection.

In addition, according to analog electronic clock of the present invention, can reduce the impact of load change and rotate accurately detection, therefore, can realize accurately take the needle, low power consumption.

Accompanying drawing explanation

Fig. 1 is the shared block diagram of stepping motor control circuit, movement and analog electronic clock of each execution mode of the present invention.

Fig. 2 is the structure chart at the stepping motor of the analog electronic clock use of each execution mode of the present invention.

Fig. 3 is the sequential chart of stepping motor control circuit, movement and the analog electronic clock of the present invention's the 1st execution mode.

Fig. 4 is the process decision chart of stepping motor control circuit, movement and the analog electronic clock of the present invention's the 1st execution mode.

Fig. 5 is the part detailed circuit diagram of stepping motor control circuit, movement and the analog electronic clock of the present invention the 1st, the 3rd execution mode.

Fig. 6 is the sequential chart of stepping motor control circuit, movement and the analog electronic clock of the present invention's the 1st execution mode.

Fig. 7 is the sequential chart of stepping motor control circuit, movement and the analog electronic clock of the present invention's the 1st execution mode.

Fig. 8 is the flow chart of stepping motor control circuit, movement and the analog electronic clock of the present invention's the 1st execution mode.

Fig. 9 is the sequential chart of stepping motor control circuit, movement and the analog electronic clock of the present invention's the 2nd execution mode.

Figure 10 is the process decision chart of stepping motor control circuit, movement and the analog electronic clock of the present invention's the 2nd execution mode.

Figure 11 is the shared part detailed circuit diagram of stepping motor control circuit, movement and the analog electronic clock of the present invention's the 2nd execution mode.

Figure 12 is the sequential chart of stepping motor control circuit, movement and the analog electronic clock of the present invention's the 2nd execution mode.

Figure 13 is the sequential chart of stepping motor control circuit, movement and the analog electronic clock of the present invention's the 2nd execution mode.

Figure 14 is the flow chart of stepping motor control circuit, movement and the analog electronic clock of the present invention's the 2nd execution mode.

Figure 15 is the sequential chart of stepping motor control circuit, movement and the analog electronic clock of the present invention's the 3rd execution mode.

Figure 16 is the process decision chart of stepping motor control circuit, movement and the analog electronic clock of the present invention's the 3rd execution mode.

Figure 17 is the sequential chart of stepping motor control circuit, movement and the analog electronic clock of the present invention's the 3rd execution mode.

Figure 18 is the sequential chart of stepping motor control circuit, movement and the analog electronic clock of the present invention's the 3rd execution mode.

Figure 19 is the flow chart of stepping motor control circuit, movement and the analog electronic clock of the present invention's the 3rd execution mode.

Label declaration

101 oscillating circuits; 102 frequency dividing circuits; 103 control circuits; 104 main driving pulses produce circuit; 105 corrected drive pulses produce circuit; 106 motor-drive circuits; 107 stepping motors; 108 rotation detection circuits; Decision circuit between 109 detection zones; 111 watchcases; 112 simulation display parts; 113 movements; 114 hour hands; 115 minute hands; 116 hour hands; 201 stators; 202 rotors; 203 rotors are accommodated with through hole; 204,205 notch parts (inner groovy); 206,207 notch parts (outer groove); 208 magnetic cores; 209 drive coils; 210,211 saturable portions; OUT1 the 1st terminal; OUT2 the 2nd terminal; 301,302 detect resistance; 303 ON-OFF control circuit; 304,310,311 comparators; 305,306 inverters; 307NAND circuit; Q1～Q6 transistor.

Embodiment

Below, embodiments of the present invention are described.In addition, in the accompanying drawing of each execution mode, to thering is the part of same function, mark same label.

Fig. 1 be each execution mode of the present invention stepping motor control circuit, have above-mentioned stepping motor control circuit movement, there is the shared block diagram of analog electronic clock of above-mentioned movement, the example of simulation electronic wrist-watch is shown.

In Fig. 1, analog electronic clock possesses: oscillating circuit 101, and it produces the signal of preset frequency; Frequency dividing circuit 102, its signal that oscillating circuit 101 is produced carries out frequency division, produces the clock and watch signal as timing benchmark; And control circuit 103, it carries out take that timing action is representative, to form the electronic watch control of each electronic circuit key element or the change of driving pulse and controls various controls such as (pulse controls), wherein, timing action is by counting to carry out to above-mentioned clock and watch signal.

In addition, analog electronic clock possesses: main driving pulse produces circuit 104, and it,, according to the main driving pulse control signal from control circuit 103, selects and export in the mutually different multiple main driving pulse P1 of energy; And corrected drive pulse produces circuit 105, it is according to the corrected drive pulse control signal from control circuit 103, the large corrected drive pulse P2 of each main driving pulse P1 described in output energy Ratios.

In addition, analog electronic clock possesses motor-drive circuit 106, the stepping motor 107 that basis is carried out the main driving pulse P1 of autonomous driving pulse generation circuit 104, produced the corrected drive pulse P2 Driving Stepping Motor 107 of circuit 105 from corrected drive pulse.

In addition, analog electronic clock possesses: watchcase 111; Simulation display part 112, the exterior side that it is configured in watchcase 111, has the moment pointer (hour hands 114, minute hand 115, second hand 116) or the calendar display part (not shown) that by stepping motor 107, are driven; And movement 113, it is configured in watchcase 111.

In addition, analog electronic clock possesses: rotation detection circuit 108, it,, utilizing main driving pulse P1 just between the detection zone after Driving Stepping Motor 107 in T, detects the induced current Ik that produces and surpass a plurality of fiducial values (these two kinds of the 1st fiducial value and the 2nd fiducial values) of being scheduled to due to the free vibration of stepping motor 107; And decision circuit 109 between detection zone, it judges rotation detection circuit 108 detects the induced current Ik over said reference value between above-mentioned detection zone in which interval in T.

In addition, after narrate in detail, in order to detect the induced current Ik over said reference value, to be configured to, utilize detecting element that induced current Ik is transformed to voltage to detect.The situation and the situation equivalence that the induced current Ik that surpasses the 1st fiducial value detected of the induced voltage signal VRs that surpasses the 1st predetermined reference voltage V inv detected, in addition, the situation and the situation equivalence that the induced current Ik that surpasses the 2nd fiducial value detected of the induced voltage signal VRs that surpasses the 2nd predetermined reference voltage V comp detected.The 2nd fiducial value is greater than the 1st fiducial value, and the 2nd reference voltage V comp is set as being greater than the value of the 1st reference voltage V inv.The 2nd reference voltage V comp is the rotation of carrying out the polarity reference voltage while detecting, the 1st reference voltage V inv be judge driving-energy surplus degree benchmark and be the rotation of carrying out another polarity reference voltage while detecting.As the 1st reference voltage V inv, the 2nd reference voltage V comp, according to same polarity, adopt the voltage of a polarity.

In addition, between detection zone, decision circuit 109 is configured to, by judging rotation detection circuit 108 detects the induced voltage signal VRs that surpasses the 1st reference voltage V inv or the 2nd reference voltage V comp between above-mentioned detection zone in which interval in T, judge the induced current Ik that surpasses above-mentioned the 1st fiducial value or the 2nd fiducial value to be detected in which interval in T between detection zone.T between the detection zone of the rotary state that detects stepping motor 107 is set after main driving pulse P1 has just disconnected, and T between this detection zone is divided into a plurality of intervals (being these 3 intervals of interval T1～T3 in the present embodiment).

Between detection zone, in each interval of decision circuit 109 T between detection zone, judge whether the detected induced voltage signal VRs of (decision content) rotation detection circuit 108 surpasses reference voltage V inv, Vcomp, according to the integrated mode of the decision content in each interval (pattern of induced voltage signal VRs), to control circuit 103 output, represent the surplus degree of the energy that drives or the detection signal of the rotary state such as non-rotating.

It is inscapes of movement 113 that oscillating circuit 101, frequency dividing circuit 102, control circuit 103, main driving pulse produce decision circuit 109 between circuit 104, corrected drive pulse generation circuit 105, motor-drive circuit 106, stepping motor 107, rotation detection circuit 108 and detection zone.

The mechanical body of the clock and watch that generally, the device of the power source by clock and watch, time reference etc. formed is called movement.Sometimes the movement of electronic type is called to module.Under the completion status as clock and watch, dial plate, pointer are installed on movement, and are contained in watchcase.

Control circuit 103 also has following function etc.: the pattern that whether surpasses the decision content of reference voltage V inv, Vcomp according to induced voltage signal VRs in each interval in T between detection zone is judged the rotary state (whether rotate, the surplus degree of the energy of main driving pulse P1 etc.) of stepping motor 107.

Rotation detection circuit 108 is judged the level of the induced voltage signal VRs producing due to the free vibration of stepping motor 107 after just having rotarilyd actuate, detects the generation of the induced voltage signal VRs that surpasses reference voltage V inv, Vcomp constantly.Reference voltage V inv, Vcomp are set to value as follows, and this value can according to detecting that interval integrated mode over the induced voltage signal VRs of reference voltage V inv, Vcomp is rotated or non-rotating etc., (pulse control) be controlled in the judgement of rotary state and the change of driving pulse.

In the situation that the rotor of the stepping motor 107 as the situation etc. that stepping motor 107 has carried out rotation surpasses the action of certain speed, detect the induced voltage signal VRs that surpasses the 2nd reference voltage V comp, in the situation that the rotor of the stepping motor 107 situation about not being rotated as stepping motor 107 etc. does not surpass the action of certain speed, do not detect the induced voltage signal VRs that surpasses the 2nd reference voltage V comp.The 1st reference voltage V inv is set as to the value lower than the 2nd reference voltage V comp.For example, the 2nd reference voltage V comp is set as to supply voltage.In addition, can utilize the threshold voltage of the inverter while making stepping motor control circuit carry out integrated circuit (IC) change as the 1st reference voltage V inv, thus the 1st reference voltage is set as to 1/2 of supply voltage.

Here, oscillating circuit 101 and frequency dividing circuit 102 form signal generator, and simulation display part 112 forms display part.Between control circuit 103, rotation detection circuit 108 and detection zone, decision circuit 109 forms rotation test section.Main driving pulse produces circuit 104 and corrected drive pulse produces circuit 105 formation driving pulse generating units.Motor-drive circuit 106 forms motor driving part.Oscillating circuit 101, frequency dividing circuit 102, control circuit 103, main driving pulse produce circuit 104, corrected drive pulse produces circuit 105 and motor-drive circuit 106 forms control part.In addition, oscillating circuit 101, frequency dividing circuit 102, control circuit 103, main driving pulse produce circuit 104, corrected drive pulse produces decision circuit 109 between circuit 105, motor-drive circuit 106, rotation detection circuit 108 and detection zone and forms stepping motor control circuit.

Above-mentioned rotation test section detects the induced current Ik that flows through drive coil 209 due to the free vibration of stepping motor 107 in being divided between the detection zone in a plurality of intervals, utilization is along with the situation that the relative load of the driving-energy with respect to stepping motor 107 increases, the detection of induced current Ik postpones constantly and the level of induced current Ik reduces, according to being illustrated in above-mentioned each interval the rotary state that detects stepping motor 107 over the faradic pattern of pre-determined reference value whether detected.

As the moment pointer (hour hands 114, minute hand 115, second hand 116) of common action, explained in general takes the needle action, in Fig. 1, oscillating circuit 101 produces the signal of preset frequency, the above-mentioned signal that 102 pairs of oscillating circuits of frequency dividing circuit 101 produce carries out frequency division, generation as the clock and watch signal of timing benchmark (for example, the signal in 1 second cycle), export control circuit 103 to.

103 pairs of above-mentioned clock and watch signals of control circuit are counted, big or small (in order to utilize with the supply voltage corresponding to load, the surplus degree of driving-energy) the main driving pulse P1 of corresponding energy is rotated driving according to predetermined period to stepping motor 107, to main driving pulse, produces the main driving pulse control signal of circuit 104 output.

In the embodiments of the present invention, prepare multiple driving pulse, as for stepping motor 107 being rotated to the driving pulse of driving.As above-mentioned driving pulse, adopt the main driving pulse P1 of energy mutually different multiple (that is, a plurality of grades), energy to be greater than the corrected drive pulse P2 of above-mentioned each main driving pulse P1.

Main driving pulse P1 makes for stepping motor 107 normally being rotated when conventionally moving the driving pulse that pointer 114～116 takes the needle constantly.In addition, corrected drive pulse P2 is in the situation that conventionally utilize the driving of main driving pulse P1 cannot make stepping motor 107 rotations (normally rotation) make forcibly the driving pulse of stepping motor 107 rotations during action.

Main driving pulse produces circuit 104 and will output to motor-drive circuit 106 with the main driving pulse P1 from energy grade corresponding to the main driving pulse control signal of control circuit 103.Motor-drive circuit 106 utilizes described main driving pulse P1 to be rotated driving to stepping motor 107.Stepping motor 107 is driven in rotation by above-mentioned main driving pulse P1, and moment pointer 114～116 is rotated to driving.Thus, the in the situation that of stepping motor 107 normal rotation, in simulation display part 112, utilize pointer 114～116 constantly to carry out current time demonstration.

The action of rotation detection circuit 108 is according to each execution mode and difference, after at length narrate.Put it briefly, in the 1st execution mode of the present invention, rotation detection circuit 108 adopts two kinds of baseline threshold voltage Vinv, Vcomp, between predetermined detection zone in T, the induced current Ik that utilizes detecting element by the rotation free vibration due to stepping motor 107 and produce in drive coil 209 is transformed to induced voltage signal VRs, detects and surpasses the induced voltage signal VRs of reference voltage V inv, Vcomp as the signal of the induced current Ik equivalence with over pre-determined reference value (the 1st fiducial value, the 2nd fiducial value).That is, rotation detection circuit 108, by detect the induced voltage signal VRs that surpasses reference voltage V inv, Vcomp in T between detection zone, detects the induced current Ik that surpasses pre-determined reference value (the 1st fiducial value, the 2nd fiducial value) equivalently.

In the 2nd execution mode of the present invention, rotation detection circuit 108 adopts a kind of baseline threshold voltage Vcomp, between predetermined detection zone in T, the induced current Ik that utilizes detecting element by the rotation free vibration due to stepping motor 107 and produce in drive coil 209 is transformed to induced voltage signal VRs, detects and surpasses the induced voltage signal VRs of reference voltage V comp as the signal of the induced current Ik equivalence with over pre-determined reference value.That is, rotation detection circuit 108, by detect the induced voltage signal VRs that surpasses reference voltage V comp in T between detection zone, detects the induced current Ik that surpasses pre-determined reference value equivalently.

In addition, in the 3rd execution mode of the present invention, rotation detection circuit 108 and the same employing of above-mentioned the 1st execution mode two kinds of baseline threshold voltage Vinv, Vcomp, between predetermined detection zone in T, the induced current Ik that utilizes detecting element by the rotation free vibration due to stepping motor 107 and produce in drive coil 209 is transformed to induced voltage signal VRs, detects and surpasses the induced voltage signal VRs of reference voltage V inv, Vcomp as the signal of the induced current Ik equivalence with over pre-determined reference value (the 1st fiducial value, the 2nd fiducial value).That is, rotation detection circuit 108, by detect the induced voltage signal VRs that surpasses reference voltage V inv, Vcomp in T between detection zone, detects the induced current Ik that surpasses pre-determined reference value (the 1st fiducial value, the 2nd fiducial value) equivalently.

In each execution mode of the present invention, reference voltage V inv, Vcomp are set as, at the rotor that has carried out the stepping motor 107 the situation etc. of rotation as stepping motor 107, carry out in QA situation to a certain degree, induced voltage signal VRs surpasses reference voltage V inv, Vcomp, in addition, rotor situation of not rotating as stepping motor 107 etc. does not carry out in QA situation to a certain degree, and induced voltage signal VRs is no more than reference voltage V inv, Vcomp.

The detection moment and the interval of the decision circuit 109 induced voltage signal VRs that surpasses reference voltage V inv, Vcomp that relatively rotation detection circuit 108 detects between detection zone, the pattern of generation induced voltage signal VRs, the surplus degree of judgement driving-energy.

Like this, rotation detection circuit 108 detects the induced voltage signal VRs that surpasses reference voltage V inv, Vcomp (the induced current Ik that in other words, surpasses fiducial value) that stepping motor 107 produces.Between detection zone, decision circuit 109 judges above-mentioned induced voltage signal VRs belongs to which interval in T between detection period, according to the interval pattern under expression induced voltage signal VRs, judges the driving surplus degree of the driving pulse now driving.

Control circuit 103 is according to the pattern of the induced voltage signal VRs from decision circuit between detection zone 109, to main driving pulse, produce the circuit 104 main driving pulse control signals of output and carry out pulse control, to make the action (pulse rising) of 1 grade of energy rising of main driving pulse P1, make the action (pulse decline) of energy decreases 1 grade of main driving pulse P1 or maintain main driving pulse P1 not change, in addition, to corrected drive pulse, produce circuit 105 output calibration driving pulse control signals and carry out pulse control, to utilize corrected drive pulse P2 to drive.

Main driving pulse produces circuit 104, corrected drive pulse produces circuit 105 driving pulse corresponding with above-mentioned control signal outputed to motor-drive circuit 106, and motor-drive circuit 106 utilizes this driving pulse to be rotated driving to stepping motor 107.

Fig. 2 is the structure chart of the stepping motor 107 that uses in each execution mode of the present invention, is illustrated in analog electronic clock the example of stepping motor for the general clock and watch that use.

In Fig. 2, stepping motor 107 possesses: have rotor and accommodate stator 201 with through hole 203, be rotatably provided in rotor and accommodate with the rotor 202 in through hole 203, the magnetic core 208 engaging with stator 201, be wrapped in the drive coil 209 on magnetic core 208.When using stepping motor 107 in analog electronic clock, stator 201 and magnetic core 208 are fixed to base plate (not shown) by screw (not shown) and go up and be bonded with each other.Drive coil 209 has the 1st terminal OUT1, the 2nd terminal OUT2.

Rotor 202 the two poles of the earth (the S utmost point and the N utmost point) that are magnetized out.In the outer end of the stator 201 being formed by magnetic material, accommodate use through hole 203 across rotor, on position respect to one another, be provided with a plurality of (in present embodiment being two) notch parts (outer groove) 206,207.Outside each, groove 206,207 and rotor are accommodated with being provided with saturable portion 210,211 between through hole 203.

Saturable portion 210,211 is configured to, and can magnetic saturation not occur because of the magnetic flux of rotor 202, but reaches magnetic saturation and increase its magnetic resistance during by excitation when drive coil 209.Rotor is accommodated with through hole 203 and is configured to circular hole shape, and the relative part place that is circular through hole at profile has formed a plurality of (being in the present embodiment two) half moon notch part (inner groovy) 204,205.

Notch part 204,205 is configured for the location division of the stop position of definite rotor 202.Drive coil 209 not by the state of excitation under, rotor 202 stably stops at the position corresponding with described location division as shown in Figure 2, in other words, the magnetic pole shaft A position (position of angle θ 0) vertical with the line segment that is connected notch part 204,205 that stops at rotor 202 located.XY coordinate space centered by rotating shaft by rotor 202 (pivot) is divided into 4 quadrants (the 1st quadrant I～4th quadrant IV).

Now, for example, when providing the driving pulse (establish the 1st terminal OUT1 side be negative pole for anodal, the 2nd terminal OUT2 side) of square wave to overdrive current i at the direction of arrow upper reaches of Fig. 2 between terminal OUT1 from motor-drive circuit 106 to drive coil 209, OUT2 from, on stator 201, along dotted arrow direction, produce magnetic flux.Thus, thereby the saturated magnetic resistance of saturable portion 210,211 increases, then, due to the magnetic pole producing in stator 201 and the interaction between the magnetic pole of rotor 202, rotor 202 is along the direction of arrow Rotate 180 degree of Fig. 2, and magnetic pole shaft stably stops at the position of angle θ 1.In addition, if by stepping motor 107 is rotated drive conventionally move (owing to being analog electronic clock in the present embodiment, being therefore the action that takes the needle) direction of rotation (in Fig. 2 for counterclockwise) for forward, its rightabout (clockwise direction) be reverse.

Then, when the rectangular wave drive pulse that provides opposite polarity as the terminal OUT1 from motor-drive circuit 106 to drive coil 209, OUT2 (establish the 1st terminal OUT1 side is that negative pole, the 2nd terminal OUT2 side are anodal in order to produce the polarity contrary with above-mentioned driving) is overdrived current i at the direction upper reaches contrary with arrow of Fig. 2, the rightabout along dotted arrow in stator 201 produces magnetic flux.Thus, first, saturable portion 210,211 is saturated, then, due to the magnetic pole producing in stator 201 and the interaction between the magnetic pole of rotor 202, rotor 202 is to direction same as described above (forward) Rotate 180 degree, and magnetic pole shaft stably stops at the position of angle θ 0.

Then, to drive coil 209, provide the signal that polarity is different (alternating signal) to repeat above-mentioned action by this way, thereby can make rotor 202 along direction of arrow Yi180Du Wei unit continuous rotation.

Control circuit 103 is rotated driving by utilizing the mutually different main driving pulse P1 of polarity alternately to drive to stepping motor 107, in the situation that utilizing main driving pulse P1 to rotate, utilize with the corrected drive pulse P2 of this main driving pulse P1 identical polar and be rotated driving.

Fig. 3 is the sequential chart while utilizing main driving pulse P1 to carry out Driving Stepping Motor 107 in the present invention's the 1st execution mode, illustrates in the lump with the surplus degree of energy of the corresponding main driving pulse P1 that loads, pattern and the pulse control action of the induced voltage signal VRs of the position of rotation of the rotor 202 of stepping motor 107, expression rotary state.

Fig. 3 is the state of (utilizing main driving pulse P1 to take the needle while driving to moment pointer 114～116 in the situation that the supply voltage of analog electronic clock is rated voltage) while conventionally driving.In addition, in Fig. 3, P1 represents that the driving that main driving pulse P1 and expression utilize main driving pulse P1 to be rotated driving to rotor 202 is interval, and in addition, a～e means the region of position of rotation of the magnetic pole shaft A of the rotor 202 while utilizing main driving pulse P1 to drive.

Main driving pulse P1 has just been driven to the scheduled time T as between the detection zone for detection of rotary state after finishing, T between detection zone has been divided into continuous a plurality of intervals (being 3 interval T1～T3 in this 1st execution mode).In the present embodiment, the initial scheduled time after the driving of main driving pulse P1 finishes is as the 1st interval T1, using the 1st interval T1 scheduled time afterwards as the 2nd interval T2, using the 2nd interval T2 scheduled time afterwards as the 3rd interval T3.

In the situation that centered by rotor 202, residing XY coordinate space is divided into the 1st quadrant I～4th quadrant IV with the rotation of rotor 202 for the magnetic pole shaft A of rotor 202, interval T1～interval T3 can be expressed as follows.

For example, under the state of the driving (rotation that surplus is little) that the load increment that do not change maintaining the grade of main driving pulse P1 is large, the 1st interval T1 is the interval of the rotary state of the initial positive direction region a of the rotor 202 in judgement the 2nd quadrant II, the 2nd interval T2 is the interval of the rotary state of the initial positive direction region b of the rotary state of the positive direction region a that judges that rotor 202 in the 2nd quadrant II is initial and the rotor 202 in the 3rd quadrant III, and the 3rd interval T3 is the interval of the rotary state of the opposite direction region c that judges that rotor 202 in the 3rd quadrant III is initial.

In addition, under the state of the medium driving (rotation that surplus is medium) of the load increment that main driving pulse P1 is carried out to pulse decline control, the 1st interval T1 is the interval of the rotary state of the initial positive direction region a of the rotor 202 in judgement the 2nd quadrant II, the 2nd interval T2 is the interval of the rotary state of the initial positive direction region b of the rotary state of the positive direction region a that judges that rotor 202 in the 2nd quadrant II is initial and the rotor 202 in the 3rd quadrant III, and the 3rd interval T3 is the interval of the rotary state of the opposite direction region c that judges that rotor 202 in the 3rd quadrant III is initial.The state of the driving (rotation that surplus is medium) that load increment is medium is the large state of state of the driving (rotation that surplus little) large with the energy Ratios load increment of main driving pulse P1 corresponding to load.

In addition, under the state of the little driving (rotation that surplus is large) of the load increment that main driving pulse P1 is carried out to pulse decline control, the 1st interval T1 is the interval of the rotary state of the initial positive direction region a of the rotor 202 in judgement the 2nd quadrant II, the 2nd interval T2 is the interval of the rotary state of the positive direction region b that judges that rotor 202 in the 3rd quadrant III is initial and the rotary state of initial opposite direction region c, and the 3rd interval T3 is the interval of the rotary state of the opposite direction region c that judges that rotor 202 in the 3rd quadrant III is initial.The state of the driving that load increment is little (rotation that surplus is large) is the large state of state of the driving (rotation that surplus medium) medium with the energy Ratios load increment of main driving pulse P1 corresponding to load.

In addition, under the state of the minimum driving (surplus is rotated greatly) of the load increment that main driving pulse P1 is carried out to pulse decline control, the 1st interval T1 is the interval of the rotary state of the initial positive direction region b of the rotor 202 in judgement the 3rd quadrant III, the 2nd interval T2 is the interval of the rotary state of the positive direction region b that judges that rotor 202 in the 3rd quadrant III is initial and the rotary state of initial opposite direction region c, and the 3rd interval T3 is the interval of judging the initial opposite direction region c of rotor 202 in the 3rd quadrant III situation below.The state of the driving (surplus is rotated greatly) that load increment is minimum is the large state of state of the driving (rotation that surplus large) little with the energy Ratios load increment of main driving pulse P1 corresponding to load.

In addition, under the state of the large driving (critical rotation) of the load increment that main driving pulse P1 is carried out to pulse rising control, the 1st interval T1 is the interval of the rotary state of the initial positive direction region a of the rotor 202 in judgement the 2nd quadrant II, the 2nd interval T2 is the interval of the rotary state of the initial positive direction region b of the rotary state of the positive direction region a that judges that rotor 202 in the 2nd quadrant II is initial and the rotor 202 in the 3rd quadrant III, and the 3rd interval T3 is the interval of the rotary state of the opposite direction region c that judges that rotor 202 in the 3rd quadrant III is initial.The state of the driving that load increment is large (critical rotation) is the little state of state of the driving (rotation that surplus little) large with the energy Ratios load increment of main driving pulse P1 corresponding to load.

In addition, in the driving that utilizes main driving pulse P1, do not rotate under the state of (utilize the driving of corrected drive pulse P2 and main driving pulse P1 is carried out to the load increment that pulse rise to control and drive greatly (non-rotating)), the 1st interval T1 is the interval of the rotary state of the initial positive direction region a of the rotor 202 in judgement the 2nd quadrant II, the 2nd interval T2 is rotary state and the 2nd quadrant II of the initial positive direction region a of the rotor 202 in judgement the 2nd quadrant II, the interval of the rotary state of the opposite direction region d that rotor 202 in the 1st quadrant I is initial, the 3rd interval T3 is the interval of the rotary state of the initial rotary state of opposite direction region d of the rotor 202 in judgement the 1st quadrant I and the positive direction region e of the 2nd time of the rotor 202 in the 1st quadrant I.It is the little state of state of the driving (critical rotation) large with the energy Ratios load increment of main driving pulse P1 corresponding to load that load increment drives the state of (non-rotating) greatly.

Prepare the reference voltage (being these two kinds of the 1st reference voltage V inv and the 2nd reference voltage V comp) of a plurality of detection induced voltage signal VRs in this 1st execution mode.

In interval T1, detect with direction to identical with drive current i and flow through the induced voltage signal VRs that the induced current Ik of drive coil 209 is corresponding.

Interval T1 is the equidirectional mobile region of drive current i and induced current Ik.When load corresponding to the energy with main driving pulse P1 becomes large, the rotation of rotor 202 is slack-off, so faradic generation postpones constantly.The induced current Ik producing before interval T1 postpones, and in interval T1, is detected.

; when load corresponding to the energy with main driving pulse P1 is less than predetermined value; at interval T1 rotor 202, with the speed faster than certain speed, be rotated; do not detect the induced current Ik over predetermined value; but when load corresponding to the energy with main driving pulse is greater than predetermined value; in interval T1, the rotation of rotor 202 is slack-off, detects the induced current Ik over predetermined value.

In this 1st execution mode, utilize this phenomenon, whether a plurality of according to detecting in interval T1 (being these two of T1, T1next in the present embodiment) surpass the induced voltage signal VRs of predetermined reference voltage, be chosen in the reference voltage using in interval T2, T3, in addition, switching detects to the selection of the direction identical with drive current i or the mobile induced current Ik of contrary direction, and the judgement, the pulse that are rotated thus situation are controlled.

Like this, according to a plurality of induced current Ik that surpass pre-determined reference value whether detected in initial interval T1, switch in the polarity that detects induced current Ik in interval T2, the T3 after interval T1 (detection side to) and detect, according to the induced current Ik in above-mentioned each interval T1～T3 (being actually the induced voltage signal VRs with induced current Ik equivalence), detecting the rotary state of stepping motor 107.Therefore, even in the situation that load to become rotation large, rotor 202 slack-off, also can the rotation of rotor 202 faster the stage be rotated detection, can reduce the impact of load change, rotate accurately detection.

In addition, in the situation that rotation is slower, can detect exactly rotary state by reducing fiducial value.In addition, cannot in the situation that in initial interval T1, detect a plurality of induced current Ik that surpass pre-determined reference value such, rotor 202 is rotated to surpass the speed of certain speed, even if do not switch the direction of induced current Ik, can not detect enough large induced voltage signal VRs yet, so do not switch the direction of induced current Ik, and according to be rotated detection with induced voltage signal VRs corresponding to the equidirectional mobile induced current Ik of main driving pulse P1, can simplify Check processing thus.

For example, in Fig. 3, state and load increment in the little driving of state, the load increment of the minimum driving of load increment (surplus is rotated greatly) (rotation that surplus is large) drive under the state of (non-rotating) greatly, an induced voltage signal VRs who surpasses the 1st reference voltage V inv in interval T1, only detected, so the rotation of using the 2nd reference voltage V comp to carry out in interval T2, T3 afterwards detects.

On the other hand, under the state of the state of the large driving (rotation that surplus is little) of state, the load increment of the medium driving of load increment (rotation that surplus is medium) and the large driving (critical rotation) of load increment, in interval T1 repeatedly (in the present embodiment, the induced voltage signal VRs that surpasses the 1st reference voltage V inv is 2, the induced voltage signal VRs that surpasses the 2nd reference voltage V comp is 1) induced current that surpasses a plurality of fiducial values detected, so use the 2nd reference voltage V comp to carry out rotation afterwards in interval T2R, T3R, detect.In addition, out1 shown in Figure 3 is used situation, the out2 of interval T1～T3 to use the situation of interval T2R, T3R.

Like this, cannot in interval T1, repeated detection be because the situation that the energy of main driving pulse P1 enough can rotate greatly smoothly or a kind of situation in not revolvable situation due to energy shortage to the situation that surpasses the induced current Ik of a plurality of fiducial values, so the rotation after not changing detects action, just can be rotated exactly, irrotational detection.

On the other hand, can be in interval T1 repeated detection to the situation that surpasses the induced current Ik of a plurality of fiducial values, be that the energy of main driving pulse P1 is not completely not enough but can not be called enough large state, rotate slack-offly, may be difficult to rotate accurately judgement.But, as mentioned above the detection side by switching induced current Ik to, by after interval T2, T3 in rotation detect rotation region c when equidirectional from drive current i and induced current Ik and detect and switch to drive current i the rotation in the region b in the other direction time detects with induced current Ik, accuracy of detection is rotated in raising.

Fig. 4 is the process decision chart of concluding the pulse control action in the present invention's the 1st execution mode.

In Fig. 4, T1 represents interval T1 and is illustrated in the decision content over the 1st the induced voltage signal VRs of reference voltage V inv, Vcomp in interval T1, whether to be detected.In addition, T1next is illustrated in the decision content over the 2nd the induced voltage signal VRs of reference voltage V inv, Vcomp in interval T1, whether to be detected.

Interval T1, T2, T3 are that interval T2R, T3R make detection side to becoming the direction contrary with interval T2, T3, detect the interval of induced current Ik in drive current i and the equidirectional interval of detecting when mobile of induced current Ik.Interval T2 is identical with width and the position of interval T2R, and in addition, interval T3 is identical with time width and the position of interval T3R.That is, the difference of interval T2, T3 and interval T2R, T3R is only the detection opposite direction of induced current Ik.

As mentioned above, the situation that the induced voltage signal VRs that surpasses the 1st reference voltage V inv, the 2nd reference voltage V comp detected is expressed as to decision content " 1 ", the situation that the induced voltage signal VRs that surpasses the 1st reference voltage V inv, the 2nd reference voltage V comp do not detected is expressed as to decision content " 0 "." 1/0 " represents that decision content can be any one in " 1 ", " 0 ".In addition, "-" represents not to be thought of as the pattern of induced voltage signal VRs.

Using interval T1, T2, in the situation of the pattern of T3, whether the modal representation of induced voltage signal VRs for (detect at first over reference voltage V inv in interval T1, the decision content (T1) of the induced voltage signal VRs of Vcomp, in interval T1, whether detect for the second time over reference voltage V inv, the decision content (T1next) of the induced voltage signal VRs of Vcomp, the decision content (T2) of the induced voltage signal VRs that surpasses the 2nd reference voltage V comp in interval T2, whether detected, the decision content (T3) of the induced voltage signal VRs that surpasses the 2nd reference voltage V comp in interval T3, whether detected).

Using interval T1, T2R, in the situation of the pattern of T3R, be expressed as and (in interval T1, whether detect at first over reference voltage V inv, the decision content (T1) of the induced voltage signal VRs of Vcomp, in interval T1, whether detect over reference voltage V inv for the 2nd time, the decision content (T1next) of the induced voltage signal VRs of Vcomp, the decision content (T2R) of the induced voltage signal VRs that surpasses the 1st reference voltage V inv in interval T2R, whether detected, the decision content (T3R) of the induced voltage signal VRs that surpasses the 1st reference voltage V inv in interval T3R, whether detected).

Rotation detection circuit 108 detects and has or not the induced voltage signal VRs over reference voltage V inv, Vcomp, and between detection zone, decision circuit 109 is judged the pattern (degree more than needed that represents the energy of main driving pulse P1 of induced voltage signal VRs.), control circuit 103 is with reference to the process decision chart that is stored in Fig. 4 of control circuit 103 inside, according to above-mentioned pattern, carry out the pulses described later such as driving of pulse rising, pulse decline or the corrected drive pulse P2 of main driving pulse P1 and control, stepping motor 107 is rotated to control.

Fig. 5 is the part detailed circuit diagram of using in stepping motor control circuit, movement and the analog electronic clock of the present invention the 1st, the 3rd execution mode, is the part detailed circuit diagram of motor-drive circuit 106 and rotation detection circuit 108.

The detailed content of narrating action below, ON-OFF control circuit 303 is when rotariling actuate, in response to producing from main driving pulse generation circuit 104 or corrected drive pulse the control signal Vi that circuit 105 provides, make transistor Q2, Q3 become conducting state simultaneously or make transistor Q1, Q4 become conducting state simultaneously, in positive direction or opposite direction, to drive coil 209, provide drive current thus, thereby stepping motor 107 is rotated to driving.

In addition, in each execution mode of the present invention, main driving pulse P1 and corrected drive pulse P2 used driving-energy is provided state and the driving pulse that the waveform (comb teeth-shaped) that halted state alternately repeats according to predetermined period is provided providing that stops driving-energy being provided.

In addition, ON-OFF control circuit 303 is carried out following control when rotation detects: transistor Q3～Q6 is controlled to a kind of in conducting state, cut-off state, on off state, detect resistance 301 or the 2nd detect on resistance 302 and produce induced voltage signal VRs the 1st.

Transistor Q1, Q2 are the inscapes of motor-drive circuit 106, transistor Q5, Q6 and detection resistance the 301, the 302nd, the inscape of rotation detection circuit 108.Transistor Q3, Q4, ON-OFF control circuit 303 are motor-drive circuit 106 and the shared inscape of rotation detection circuit 108 both sides.In addition, detection resistance 301,302, comparator 304, inverter 305,306, NAND circuit 307 are inscapes of rotation detection circuit 108.Detect resistance the 301, the 302nd, the element that resistance value is identical, forms detecting element.In addition, transistor Q1～Q6 conducting resistance under conducting state is less, forms low impedance element.Detect resistance the 301, the 302nd, the resistance value that conducting resistance is larger than transistor Q1～Q6, forms high-impedance component.

The reference signal input part of comparator 304 is transfused to the 2nd reference voltage V comp, and its 1st, the 2nd input part is transfused to respectively the induced voltage signal VRs that detection resistance 301,302 detects.While producing the induced voltage signal VRs that surpasses the 2nd reference voltage V comp on detecting

resistance

301 or 302, the detection signal Vs from comparator 304 to the 109 output high level signals " 1 " of decision circuit between detection zone.

In addition, the threshold value of inverter 305,306 is set to respectively the 1st reference voltage V inv.While producing the induced voltage signal VRs that surpasses the 1st reference voltage V inv on detecting resistance 301, from inverter 306 output low level signals " 0 ", the detection signal Vs from NAND circuit 307 to the 109 output high level " 1 " of decision circuit between detection zone.While producing the induced voltage signal VRs that surpasses the 1st reference voltage V inv on detecting resistance 302, from inverter 305 output low level signals " 0 ", the detection signal Vs from NAND circuit 307 to the 109 output high level " 1 " of decision circuit between detection zone.

Between detection zone decision circuit 109 according to the detection side of induced current Ik to, the reference voltage V inv, the Vcomp that use, selection, from the detection signal Vs of comparator 304 or NAND circuit 307, judges that induced voltage signal VRs belongs to which interval T1～T3, T2R, T3R.

Fig. 6 is the sequential chart of the 1st execution mode of the present invention, the sequential chart that is the detection side of not switching induced current Ik when detecting.Sequential chart when Fig. 6 is the state of the driving that load increment is little (rotation that surplus is large), the sequential when being illustrated in induced current Ik and drive current i and detecting in mobile state (interval T1, T2, T3) in the same direction.

In the situation that stepping motor 107 is rotated to driving, ON-OFF control circuit 303 drive period P 1 constantly ta～tb during, under the state that is conducting at transistor Q3, make transistor Q2 according to predetermined period conducting state (supply condition) and cut-off state (supply halted state) and carry out switch motion repeatedly, generate thus the main driving pulse P1 of comb teeth-shaped, the drive current i of Fig. 6 direction of arrow is provided to the drive coil 209 of stepping motor 107.Thereby the in the situation that of stepping motor 107 rotation, rotor 202 is to positive direction Rotate 180 degree.

On the other hand, at the driving period P tb 1 finish time from main driving pulse P1 to the detection that is rotated situation T the detection zone of moment tc.

; in the interval T1 since moment tb; ON-OFF control circuit 303 becomes under the state of conducting state at transistor Q3, Q6; make transistor Q4 according to predetermined period with conducting state and cut-off state and carry out switch motion; thus, induced current Ik and drive current i flow through equidirectionally and detect resistance 302.Thereby produce induced voltage signal VRs on detection resistance 302.

304 couples of induced voltage signal VRs of comparator and the 2nd reference voltage V comp compare, when induced voltage signal VRs surpasses the 2nd reference voltage V comp, " 1 " is exported to decision circuit between detection zone 109 as detection signal Vs, when not surpassing, " 0 " is exported to decision circuit between detection zone 109 as detection signal Vs.

In addition, inverter 305 is output " 0 " when induced voltage signal VRs surpasses the 1st reference voltage V inv, output " 1 " when not surpassing, NAND circuit 307 will make signal " 1 " or " 0 " after its upset export to decision circuit between detection zone 109 as detection signal Vs.

Between detection zone, decision circuit 109 is according to the detection signal Vs with NAND circuit 307 from comparator 304, whether judgement detects a plurality of induced voltage signal VRs (in the present embodiment, being at least 2 induced voltage signal VRs that surpass the 1st reference voltage V comp) over predetermined reference voltage in interval T1.

In the example of Fig. 6, because a plurality of induced voltage signal VRs over predetermined reference voltage Vinv do not detected in interval T1, so the ON-OFF control circuit 303 of rotation detection circuit 108 also need not change the mobile direction of induced current Ik and detect action in interval T2, T3.Therefore, in interval T2, T3, also can drive control to each transistor, to carry out action same as described above.

In the case, in interval T2, T3, only adopting is not to use the 1st reference voltage V inv but the decision content of the induced voltage signal VRs that use the 2nd reference voltage V comp judges.That is, from the 109 input detection signal Vs of decision circuit between NAND circuit 307 and comparator 304 twocouese detection zones, but between detection zone, decision circuit 109 only determines whether and belongs to interval T2, T3 the detection signal Vs from comparator 304 in interval T2, T3.Thus, even the non-rotating situation over a plurality of induced voltage signal VRs of predetermined reference voltage Vinv do not detected in interval T1, also can adopt the 2nd reference voltage V comp that level is high to judge, can be rotated more accurately thus the judgement of situation.In addition because not the detection side of switched energization electric current I k to, so it is simple to detect action.

The pattern (the initial decision content in interval T1, the next decision content (T1next) in interval T1, the decision content of interval T2 are, the decision content of interval T3) that between detection zone, decision circuit 109 is exported induced voltage signal VRs to control circuit 103 is as its result of determination.

Control circuit 103, according to the pattern from decision circuit between detection zone 109, is judged the rotary state of stepping motor 107 with reference to the process decision chart of Fig. 4, carry out the driving isopulse of pulse decline, pulse rising+corrected drive pulse P2 and control.

After the circulation shown in Fig. 6 finishes, in next circulation, when a plurality of induced voltage signal VRs that surpasses predetermined predetermined reference voltage Vinv not detected in interval T1, to each transistor, Q1～Q6 drives control, to carry out same action.That is, replace transistor Q3 and make transistor Q4 become conducting state, and replace transistor Q2 and make transistor Q1 carry out switch drive according to the cycle identical with transistor Q2, carry out the driving of the main driving pulse P1 of comb teeth-shaped of the polarity contrary with front circulation.In addition, between detection zone in T, replace transistor Q4 and make transistor Q3 carry out switch motion with the cycle identical with transistor Q4, replace transistor Q3, Q6 and transistor Q4, Q5 are driven as conducting state.Thus, the rotation of carrying out based on induced current Ik detects.

On resistance 301, produce the induced voltage signal VRs that the rotation due to stepping motor 107 produces detecting, comparator 304 exports the result of induced voltage signal VRs and the 2nd reference voltage V comp comparison between detection zone decision circuit 109 as detection signal Vs.In addition, 306 couples of induced voltage signal VRs of inverter and the 1st reference voltage V inv compare, according to comparative result output " 1 " or " 0 ", NAND circuit 307 will make signal " 0 " or " 1 " after its upset export decision circuit 109 between detection zone to as detection signal Vs.

When a plurality of induced voltage signal VRs that surpasses predetermined reference voltage V inv not detected in interval T1, carry out above-mentioned same action, same with front circulation in interval T2, T3, between detection zone, decision circuit 109 only carries out interval judgement to the detection signal Vs from comparator 304.

Between detection zone, decision circuit 109 is to the pattern (the initial decision content in interval T1, next decision content (T1next) in interval T1, the decision content of interval T2 are, the decision content of interval T3) of control circuit 103 output induced voltage signal VRs.

Control circuit 103, according to the pattern from decision circuit between detection zone 109, is judged the rotary state of stepping motor 107, and the driving isopulse carrying out based on pulse decline, pulse rising+corrected drive pulse P2 is controlled.

When a plurality of induced voltage signal VRs that surpasses predetermined reference voltage V inv not detected in interval T1, by alternately above-mentioned 2 circulations repeatedly, carry out the rotation of stepping motor 107 and control.

Fig. 7 is the sequential chart of the 1st execution mode of the present invention, the sequential chart that is the detection side of switching induced current Ik when detecting, the sequential when state of the driving that load increment is large (rotation that surplus is little) is shown.In Fig. 7, for the detection side of induced current Ik being detected to switching to rightabout in interval T2R, T3R, make to detect after the polarity upset of induced voltage signal VRs.Thus, being configured to, is not in the c of the region of time delay, to detect as shown in Figure 6, but can in the b of the region of time advance, detect induced voltage signal VRs, even in the situation that rotation is slow, can be rotated more accurately detection yet.

In the situation that stepping motor 107 is rotated to driving, ON-OFF control circuit 303 drive period P 1 constantly ta～tb during in, under the state of transistor Q3 conducting, conducting state (supply condition) and cut-off state (supply halted state) are carried out switch motion repeatedly with predetermined period to make transistor Q2, utilize thus the main driving pulse P1 of comb teeth-shaped, the drive current i of Fig. 5 direction of arrow is provided to the drive coil 209 of stepping motor 107.Thus, the in the situation that of stepping motor 107 rotation, rotor 202 is to positive direction Rotate 180 degree.

On the other hand, the finish time of the driving period P 1 from main driving pulse P1 tb to the detection that is rotated situation T the detection zone of moment tc.

; in the interval T1 since moment tb; ON-OFF control circuit 303 becomes under the state of conducting state at transistor Q3, Q6; make transistor Q4 with conducting state and cut-off state, carry out switch motion according to predetermined period, induced current Ik and drive current i flow through equidirectionally and detect resistance 302 thus.Thereby produce induced voltage signal VRs in detecting resistance 302.

In addition, inverter 305 is output " 0 " when induced voltage signal VRs surpasses the 1st reference voltage V inv, output " 1 " when not surpassing, NAND circuit 307 will make signal " 1 " or " 0 " of its upset export to decision circuit between detection zone 109 as detection signal Vs.

Between detection zone, decision circuit 109, according to the detection signal Vs with NAND circuit 307 from comparator 304, is judged a plurality of induced voltage signal VRs (being 2 induced voltage signal VRs that surpass the 1st reference voltage V inv in the present embodiment) that whether detect in interval T1 over predetermined reference voltage.That is, between detection zone, decision circuit 109 is judged in interval T1, whether the rotation of rotor 202 slower than predetermined speed.

In the example of Fig. 7, because a plurality of induced voltage signal VRs (in the present embodiment for surpassing 2 induced voltage signal VRs of the 1st reference voltage V inv) (the slower state of rotation of rotor 202 over predetermined reference voltage detected in interval T1.), so ON-OFF control circuit 303 is moved in the interval after interval T1 (interval T2R, interval T3R), the detection side of induced current Ik is detected to the direction switching to contrary before this.

In interval T2R, T3R, ON-OFF control circuit 303 becomes conducting state at transistor Q4, Q5, transistor Q6 becomes under the state of cut-off state, make transistor Q3 with conducting state and cut-off state, carry out switch motion according to predetermined period, thus, induced current Ik is flow through and detect resistance 301.On detection resistance 301, produce detection side to the induced voltage signal VRs contrary with interval T2, T3, carry out detection side to the detection that is switched to reciprocal induced current Ik.Thus, detect the induced voltage signal VRs producing in the b of region.

In addition, inverter 306 is when induced voltage signal VRs surpasses the 1st reference voltage V inv, and output " 0 ", when not surpassing, output " 1 ", NAND circuit 307 will make signal " 1 " or " 0 " after its upset export to decision circuit between detection zone 109 as detection signal Vs.

In interval T2R, T3R, because rotation level slow, induced signal VRs is lower, so in order to improve detection sensitivity, only adopting is not to use the 2nd reference voltage V comp but the decision content of the induced voltage signal VRs that use the 1st reference voltage V inv judges.; from the 109 input detection signal Vs of decision circuit between NAND circuit 307 and comparator 304 twocouese detection zones; but between detection zone, decision circuit 109, in interval T2R, T3R, only determines whether and belongs to interval T2R, T3R the detection signal Vs from NAND circuit 307.

Control circuit 103, according to the pattern from decision circuit between detection zone 109, is judged the rotary state of stepping motor 107, carries out pulse decline, maintains, pulse rising isopulse controls.

Like this, when being judged to be energy rotation less and rotor 202 with the corresponding main driving pulse P1 that loads when slower in interval T1, in interval after interval T1, the detection side of induced current Ik is detected to switching to rightabout, be rotated the judgement of situation, can in the stage (the rotary area b of rotor 202), be rotated detection faster in the rotation of rotor thus, so can detect more accurately rotary state.In addition, in the situation that the rotation of rotor 202 level slow and induced voltage signal VRs is lower, a plurality of induced voltage signal VRs (in the present embodiment for surpassing 2 induced voltage signal VRs of the 1st reference voltage V inv) over predetermined reference voltage in interval T1, also can be detected, so can stablize reliably, be still in the position vertical with the line segment that is connected notch part 204,205, by being used as the 1st reference voltage V inv of lower reference voltage, can carrying out rotary state more accurately and judge.

After circulation shown in Fig. 7 finishes, in next circulation, when a plurality of induced voltage signal VRs that surpasses a plurality of predetermined reference voltage Vinv, Vcomp being detected in interval T1, to each transistor, Q1～Q6 drives control, to carry out above-mentioned same action.That is, replace transistor Q3 and make transistor Q4 become conducting state, and replace transistor Q2 and make Q1 carry out switch drive according to the cycle identical with transistor Q2, carry out the driving of the main driving pulse P1 of comb teeth-shaped based on front circulation opposite polarity.

Between detection zone in the interval T1 of T, replace transistor Q4 and make transistor Q3 carry out switch motion with the cycle identical with transistor Q4, replace transistor Q3, Q6 and transistor Q4, Q5 are driven as conducting state.Thus, induced current Ik and drive current i flow through equidirectionally and detect resistance 301, on detection resistance 301, produce induced voltage signal VRs.Thus, the rotation of carrying out based on the equidirectional mobile induced current Ik of drive current i detects.

In addition, in interval T2R, T3R, replacing transistor Q4, Q5, transistor Q3, Q6 are become under the state of conducting state, replace transistor Q3 and make transistor Q4 with conducting state and cut-off state, carry out switch motion according to predetermined period, make thus induced current Ik flow through and detect resistance 302.On detection resistance 302, produce induced voltage signal VRs, thus, carry out detection side to the detection that is switched to rightabout induced current Ik.

Same with front circulation, the induced voltage signal VRs producing due to the rotation of stepping motor 107 obtains decision content according to the 1st reference voltage V inv and the 2nd reference voltage V comp in interval T1, in addition, in interval T2R, T3R, only according to the 1st reference voltage V inv, obtain decision content.

When in interval T1, detect over predetermined reference voltage Vinv a plurality of induced voltage signal VRs time, alternately repeat above-mentioned 2 circulations, carry out thus the rotation of stepping motor 107 and control.

By the combination of above-mentioned 4 circulations, carry out that energy size with main driving pulse P1 corresponding to load rotarilys actuate action accordingly, rotation detects action, pulse control action.

Fig. 8 is the flow chart of the action of stepping motor control circuit, movement and analog electronic clock that the present invention's the 1st execution mode is shown, is the flow chart that the processing of control circuit 103 is mainly shown.

Below, with reference to Fig. 1～Fig. 8, explain the action of the present invention's the 1st execution mode.

In Fig. 1, oscillating circuit 101 produces the reference clock signal of preset frequency, and the above-mentioned signal that 102 pairs of oscillating circuits of frequency dividing circuit 101 produce carries out frequency division, produces the clock and watch signal as timing benchmark, exports control circuit 103 to.

103 pairs of above-mentioned clock and watch signals of control circuit are counted, and implement timing action, first, and by the energy grade n of main driving pulse P1n and represent that the count value N of the Continuous Drive number of times of same main driving pulse P1 is reset to 0 (the step S501 of Fig. 8).

Control circuit 103 carries out initial setting, and the induced current Ik (in other words induced voltage signal VRs) that rotation detection circuit 108 bases and drive current i are flowed equidirectionally is rotated detection (being made as Rs-N) (step S502).

Then, the main driving pulse control signal of control circuit 103 output, is rotated driving (step S503, S504) in order to the main driving pulse P10 that is used in the least energy of setting in treatment step S501 to stepping motor 107.

Main driving pulse produces circuit 104 in response to the above-mentioned control signal from control circuit 103, to the motor-drive circuit 106 output main driving pulse P10 corresponding with above-mentioned control signal.Motor-drive circuit 106 utilizes main driving pulse P10 to be rotated driving to stepping motor 107.Stepping motor 107 is rotarilyd actuate by main driving pulse P10, thereby the moment pointer 114～116 of simulation display part 112 is rotated to driving.Thus, the in the situation that of stepping motor 107 normal rotation, in simulation display part 112, utilize pointer 114～116 constantly to show at any time current time.In addition, when 107 pairs of not shown calendar display parts of stepping motor have carried out rotary actuation, calendar shows the demonstration that is switched to next day.

Rotation detection circuit 108 detect have or not with drive current i equidirectional flow and surpass the induced current Ik of pre-determined reference value.In other words, rotation detection circuit 108 judges a plurality of induced voltage signal VRs that surpass a plurality of predetermined reference voltage Vinv, Vcomp in interval T1, whether to be detected.That is, rotation detection circuit 108 is first as illustrated in Fig. 6, Fig. 7, drive so that induced current Ik and drive current i flow equidirectionally, and detect induced voltage signal VRs.Control circuit 103 judges whether rotation detection circuit 108 detects the induced voltage signal VRs (step S505) that surpasses the 1st reference voltage V inv.

When being judged to be in treatment step S505 while the induced signal that surpasses the 1st reference voltage V inv not detected, control circuit 103 is controlled rotation detection circuits 108, make not change as shown in Figure 6 in interval afterwards and the detection side that maintains induced current Ik to and determine whether and the induced voltage signal VRs that surpasses the 2nd reference voltage V comp detected.Between detection zone, decision circuit 109 judges which interval T2, T3 the induced voltage signal VRs that surpasses the 2nd reference voltage V comp that rotation detection circuit 108 detects belongs to.

Control circuit 103 judges the induced voltage signal VRs (step S506) that surpasses the 2nd reference voltage V comp in interval T2, whether to be detected, when being judged to be while the induced voltage signal VRs that surpasses the 2nd reference voltage V comp not detected in interval T2, judge the induced voltage signal VRs (step S507) that surpasses the 2nd reference voltage V comp in interval T3, whether to be detected.

When being judged to be in treatment step S507 while the induced voltage signal VRs that surpasses the 2nd reference voltage V comp not detected in interval T3, (load increment drives the situation of (non-rotating) greatly.), control circuit 103 produces circuit 105 output control signals to corrected drive pulse, to utilize corrected drive pulse P2 to drive (step S508).Corrected drive pulse produces circuit 105 in response to the above-mentioned control signal from control circuit 103, to motor-drive circuit 106 output calibration driving pulse P2.Motor-drive circuit 106 utilizes corrected drive pulse P2 to make forcibly stepping motor 107 be rotated.

Then, when the energy grade n of the main driving pulse P1 of this driving (the main driving pulse for the treatment of step S504) is not greatest level m (step S509), control circuit 103 makes 1 grade of grade n rising of the main driving pulse P1 of driving next time, then, be back to treatment step S502 (step S510).Main driving pulse produces circuit 104 and in next treatment step S504, utilizes the main driving pulse P1 (n+1) rising after 1 grade to be rotated driving.

When being judged to be the grade n of main driving pulse P1 being greatest level m in treatment step S509, owing to can not improving the grade n of main driving pulse P1, can not rotate, so in order to realize power saving, control circuit 103 is the main driving pulse P1 (n-a) reducing after predetermine level a by the level setting of main driving pulse P1, then, be back to treatment step S502 (step S511).

When be judged to be (the situation of load increment minimum (surplus is rotated greatly) while the induced voltage signal VRs that surpasses the 2nd reference voltage V comp being detected in interval T2 in treatment step S506.), control circuit 103 judges whether main driving pulse P1 is the lowest class 0 (step S530).

When being judged to be the grade n of main driving pulse P1 being not the lowest class 0 in treatment step S530, control circuit 103 makes the count value N of Continuous Drive number of times add 1 (step S532), judges whether count value N is pre-determined number (in this 1st execution mode, being 80 times) (step S533).

When being judged as in treatment step S533 while not becoming above-mentioned pre-determined number, control circuit 103 does not change the grade n of main driving pulse P1 and is back to treatment step S502 (step S531), when being judged as while becoming above-mentioned pre-determined number, make 1 grade of grade n decline of main driving pulse P1, and make count value N be reset to 0, be back to treatment step S502 (step S534).

When being judged to be main driving pulse P1 being the lowest class 0 in treatment step S530, control circuit 103 shifts to treatment step S531, does not change the grade n of main driving pulse P1 and is back to treatment step S502.

On the other hand, when being judged to be rotation detection circuit 108 the induced voltage signal VRs that surpasses the 1st reference voltage V inv detected in treatment step S505, control circuit 103 judges whether this induced voltage signal VRs surpass the 2nd reference voltage V comp (step S520).

When being judged to be this induced voltage signal VRs over the 2nd reference voltage V comp in treatment step S520, control circuit 103 is transferred to treatment step S506.

When being judged to be this induced voltage signal VRs over the 2nd reference voltage V comp in treatment step S520, control circuit 103 judges whether the induced voltage signal VRs (T1next) that next rotation detection circuits 108 detect surpasses the 1st reference voltage V comp (step S521) in interval T1.

When being judged to be the above-mentioned induced voltage signal VRs (T1next) next detecting not surpassing the 1st reference voltage V comp in treatment step S521 in interval T1, control circuit 103 is transferred to treatment step S506.

When being judged to be when the above-mentioned induced voltage signal VRs (T1next) next detecting surpasses the 1st reference voltage V inv in interval T1, (situation of a plurality of induced voltage signal VRs that surpass a plurality of reference voltages detected in treatment step S521.), control circuit 103 is controlled rotation detection circuit 108 as shown in Figure 7, so that the detection side of induced current Ik (in other words, induced voltage signal VRs) is rotated to detection (being made as Rs-R) (step S522) to switching to rightabout.

After, rotation detection circuit 108 is as shown in Figure 7 in interval T2R, T3R, change detection resistance 301,302, thus by the detection side of induced current Ik to switching to rightabout, detect and to have or not the induced voltage signal VRs that surpasses the 1st reference voltage V inv.Between detection zone, decision circuit 109 judges whether the induced voltage signal VRs that surpasses the 1st reference voltage V inv that rotation detection circuit 108 detects belongs to interval T2R, T3R, to the pattern of control circuit 103 output induced voltage signal VRs.

; control circuit 103 judges whether the above-mentioned induced voltage signal VRs next detecting surpasses the 2nd reference voltage V comp (step S523) in interval T1; when being judged to be the above-mentioned induced voltage signal VRs next detecting over the 2nd reference voltage V comp, judge other induced voltage signal VRs (step S525) that surpasses the 1st reference voltage V inv in interval T2R, whether to be detected.

When being judged to be in treatment step S525 while other induced voltage signal VRs that surpasses the 1st reference voltage V inv not detected in interval T2R, control circuit 103 judges the induced voltage signal VRs (step S526) that surpasses the 1st reference voltage V inv in interval T3R, whether to be detected.

When being judged to be in treatment step S526 while the induced voltage signal VRs that surpasses the 1st reference voltage V inv not detected in interval T3R, (load increment drives the situation of (non-rotating) greatly.), control circuit 103 is transferred to treatment step S508, when being judged to be (the situation of the driving that load increment is large (critical rotation) while the induced voltage signal VRs that surpasses the 1st reference voltage V inv being detected in interval T3R.), control circuit 103 is transferred to treatment step S509.

When be judged to be (the situation of the driving that load increment is large (rotation that surplus is little) while the induced voltage signal VRs that surpasses the 1st reference voltage V inv being detected in interval T2R in treatment step S525.), control circuit 103 is transferred to treatment step S531.

When being judged to be the above-mentioned induced voltage signal VRs next detecting not over the 2nd reference voltage V comp in treatment step S523, control circuit 103 judges the induced voltage signal VRs (step S524) that surpasses the 1st reference voltage V inv in interval T2R, whether to be detected.

When being judged to be in treatment step S524 while the induced voltage signal VRs that surpasses the 1st reference voltage V inv not detected in interval T2R, control circuit 103 is transferred to treatment step S526, when being judged to be (the situation of the driving (rotation that surplus is medium) that load increment is medium while the induced voltage signal VRs that surpasses the 1st reference voltage V inv being detected in interval T2R.), control circuit 103 is transferred to treatment step S530.

By above-mentioned processing repeatedly, select driving pulse P1, P2 with the corresponding energy of rotary state of stepping motor 107, carry out the rotary actuation of stepping motor 107.

As previously discussed, the stepping motor control circuit of the present invention's the 1st execution mode is characterised in that, possess: rotation test section, it detects the induced current Ik that flows through drive coil 209 due to the free vibration of stepping motor 107 being divided between the detection zone of a plurality of interval T1～T3 in T, utilization is along with the relative load with respect to driving-energy increases, the situation that the detection of induced current Ik postpones constantly and the level of induced current Ik reduces, according to being illustrated in the pattern over the induced current Ik of pre-determined reference value Vinv whether detected in each interval T1～T3, detect the rotary state of stepping motor 107, and control part, it selects driving pulse corresponding to rotary state detecting with described rotation test section from the mutually different multiple driving pulse of energy, utilize the driving pulse of described selection to provide drive current i to drive coil 209, stepping motor 107 is rotated to driving, described rotation test section is according to the induced current Ik over pre-determined reference value Vinv whether being detected in initial the 1st interval interval T1 of the conduct of T between detection zone, interval T2 after the 1st interval T1, in T3 the detection side of selected induced current Ik to and detect, according to the pattern of the induced current Ik based on detecting in each interval T1～T3, detect the rotary state of stepping motor 107.

Here, above-mentioned rotation test section can be configured to, when in above-mentioned the 1st interval T1, detect over pre-determined reference value Vinv induced current Ik time, interval T2 after the 1st interval T1, in T3, the detection side of induced current Ik is detected to being chosen to be the 1st direction, when the induced current Ik that surpasses above-mentioned pre-determined reference value Vinv not detected in the 1st interval T1, interval T2 after the 1st interval T1, in T3, the detection side of induced current Ik is detected to being chosen to be with reciprocal the 2nd direction of above-mentioned the 1st direction, according to the pattern of the induced current Ik based on detecting in each interval T1～T3, detect the rotary state of stepping motor 107.

In addition, above-mentioned rotation test section can be configured to, the induced current Ik of a plurality of pre-determined reference value Vinv of surpassing according to whether, between detection zone, in the 1st initial interval T1 of T, detected, in interval T2, T3 after the 1st interval T1 the detection side of selected induced current Ik to and detect, according to the pattern of the induced current Ik based on detecting, detect the rotary state of stepping motor 107 in each interval T1～T3.

In addition, above-mentioned rotation test section can be configured to, while the induced current Ik of a plurality of pre-determined reference value Vinv of surpassing being detected in the 1st initial interval T1 of T between detection zone, in interval T2, T3 after the 1st interval T1, the detection side of induced current Ik is detected to switching to the direction contrary with the 1st interval T1, according to the pattern of the induced current Ik based on detecting, detect the rotary state of stepping motor 107 in each interval T1～T3.

In addition, above-mentioned rotation test section can be configured to, while the induced current Ik of a plurality of pre-determined reference value Vinv of surpassing not detected in the 1st initial interval T1 of T between detection zone, in interval T2, T3 after the 1st interval T1, detection side is detected to induced current Ik to being made as the direction identical with the 1st interval T1, according to the pattern of the induced current Ik based on detecting, detect the rotary state of stepping motor 107 in each interval T1～T3.

In addition, can be configured in the 1st interval T1 and detect with drive current i and the equidirectional mobile mode of induced current Ik.

In addition, can be configured to and be provided with the 1st fiducial value Vinv and the 2nd fiducial value Vcomp that is greater than the 1st fiducial value Vinv as above-mentioned a plurality of fiducial values.

In addition, above-mentioned rotation test section can be configured to, while a plurality of induced current Ik that surpasses the 1st fiducial value being detected in the 1st initial interval T1 of T between detection zone, in interval T2, T3 after the 1st interval T1, according to above-mentioned the 1st fiducial value, detect induced current Ik.

In addition, above-mentioned rotation test section can be configured to, while a plurality of induced current Ik that surpasses the 1st fiducial value not detected in the 1st initial interval T1 of T between detection zone, in interval T2, T3 after the 1st interval T1, according to the 2nd fiducial value, detect induced current Ik.

In addition, can be configured to, between detection zone, T is divided into the 1st interval T1 after the driving of main driving pulse P1, the 2nd interval T2 after the 1st interval T1, the 3rd interval T3 after the 2nd interval T2, and maintaining the grade n of driving pulse and under the state of Driving Stepping Motor 107, the 1st interval T1 is the interval of rotary state of judging the initial positive direction of the rotor 202 in the 2nd quadrant II in the space centered by the rotor 202 of stepping motor 107, the 2nd interval T2 judges the rotary state of initial positive direction of rotor 202 in the 2nd quadrant II and the interval of the rotary state of the initial positive direction of the rotor 202 in the 3rd quadrant III, the 3rd interval T3 is the interval of judging the initial reciprocal rotary state of the rotor 202 in the 3rd quadrant III, when a plurality of induced current Ik that surpasses the 1st fiducial value being detected in the 1st interval T1, above-mentioned rotation test section is used the 1st fiducial value to detect induced current Ik in the 2nd interval T2 and the 3rd interval T3.

In addition, between detection zone, T is divided into main driving pulse P1 and has just driven the 1st interval T1 afterwards, the 2nd interval T2 after the 1st interval T1, the 3rd interval T3 after the 2nd interval T2, and maintaining the grade n of main driving pulse P1 and under the state of Driving Stepping Motor 107, the 1st interval T1 is the interval of rotary state of judging the initial positive direction of the rotor 202 in the 2nd quadrant II in the space centered by the rotor 202 of stepping motor 107, the 2nd interval T2 judges the rotary state of initial positive direction of rotor 202 in the 2nd quadrant II and the interval of the rotary state of the initial positive direction of the rotor 202 in the 3rd quadrant III, the 3rd interval T3 is the interval of judging the initial reciprocal rotary state of the rotor 202 in the 3rd quadrant III, when a plurality of induced current Ik that surpasses the 1st fiducial value not detected in the 1st interval T1, above-mentioned rotation test section is used the 2nd fiducial value to detect induced current Ik in the 2nd interval T2 and the 3rd interval T3.

In addition, above-mentioned rotation test section can be configured to, possess the 1st and detect resistance 301, the 2nd detects resistance 302, they detect and due to the free vibration of stepping motor 107, flow through in reverse direction each other the induced current Ik of drive coil 209, and between detection zone in T, drive coil 209 by making to comprise stepping motor 107 and detect

resistance

301 or 302 the 1st closed circuit and the 2nd closed circuit being formed by drive coil 208 and low impedance element and repeatedly replace to detect induced current Ik, according to the direction of the induced current Ik detecting, the detection resistance that forms the 1st closed circuit is switched to the 1st to be detected resistance 301 or the 2nd and detects resistance 302 and detect.

Therefore, stepping motor control circuit according to the embodiment of the present invention, can reduce the impact of load change and rotate accurately detection.

In addition, in the situation that rotation is slack-off, can be by detecting after main driving pulse P1 disconnects, the rotation in the interval (b region) of the speed maximum of rotor 202, obtain high-level and stable induced current Ik (in other words, induced voltage signal VRs), can provide and not be subject to the impact of load change and stable detection performance.

In addition, by carrying out main driving pulse P1 disconnection rotation afterwards, detect, can obtain effect as follows: be not vulnerable to the impact of load change, can realize the precision raising that produces driving control action constantly based on induced voltage signal VRs, can reduce meaningless power consumption.

In addition, because rotation accuracy of detection improves, so to have rotated error detection be non-rotating situation of carrying out the driving of corrected drive pulse P2 although can reduce, can suppress the waste of power consumption.

In addition, when utilizing rotation being accompanied by that load increases detection time, situation about postponing detects rotary state, can reduce the generation of situation as follows: in the load change more than to a certain degree (calendar load, compared with the load of large needle moment), the angular speed of rotor 202 reduces, although rotate, but induced voltage signal VRs reduces, and utilizes corrected drive pulse P2 to drive.Therefore, can reduce power consumption, and then extend the life-span of the battery using as power supply.

In addition, in the detection that utilizes induced voltage signal VRs, be constantly accompanied by the stepping motor control circuit of the situation of loading increase and postponing, can realize and not be vulnerable to the impact of load change and stable detection.

Then, the 2nd execution mode of the present invention is described.

Above-mentioned the 1st execution mode is configured to by detecting the induced signal VRs of folk prescription polarity judges rotary state, according to the result of this judgement, select the direction of induced current Ik to be rotated detection, the 2nd execution mode of the present invention is configured to, by detecting the induced signal VRs of both sides' polarity, judge rotary state, according to the result of this judgement, select the direction of induced current Ik to be rotated detection.Thus, even in the situation that the driving-energy relative reduction corresponding with load also can be selected suitable induced current Ik, the rotation of carrying out reliably region b detects, rather than the rotation of region c detection, can rotate accurately detection.In addition, in the 1st execution mode, adopt two kinds of reference voltage V inv, Vcomp as reference voltage, in this 2nd execution mode, be configured to and adopt a kind of baseline threshold voltage Vcomp as reference voltage.

Fig. 9 is the sequential chart while utilizing main driving pulse P1 Driving Stepping Motor 107 in the present invention's the 2nd execution mode.

Fig. 9 is the state of (utilizing main driving pulse P1 to take the needle while driving to moment pointer 114～116 in the situation that the supply voltage of analog electronic clock is rated voltage) while conventionally driving.In addition, in Fig. 9, P1 represents that the driving that main driving pulse P1 and expression utilize main driving pulse P1 to be rotated driving to rotor 202 is interval, and in addition, a～e means the region of position of rotation of the magnetic pole shaft A of the rotor 202 while utilizing main driving pulse P1 to drive.

Drive the scheduled period after finishing to be made as for detection of T between the detection zone of rotary state main driving pulse P1, T between detection zone is divided into continuous a plurality of intervals.Detect with in the situation that flow through the equidirectional induced current Ik of drive current of drive coil 209 while utilizing main driving pulse P1 to drive, use these 2 intervals of the 1st interval T1b and the 4th interval T2, in addition, detect with in the situation that flow through the rightabout induced current Ik of drive current of drive coil 209 while utilizing main driving pulse P1 to drive, use the 1st interval T1b, the 2nd interval T2R, these 3 intervals of the 3rd interval T3R.The time width sum of interval T2R and interval T3R equals the time width of interval T2.In addition, interval T1a is that between the blind zone arranging after main driving pulse has just driven, the induced current Ik producing in the T1a of this interval is not used in the judgement of rotary state.

In the situation that centered by rotor 202, residing XY coordinate space is divided into the 1st quadrant I～4th quadrant IV with the rotation of rotor 202 for the magnetic pole shaft A of rotor 202, interval T1b, T2, T2R, T3R can represent as follows.

For example, not changing, maintain under the state of the driving (rotation that surplus is little) that the load increment of grade of main driving pulse P1 is large, when detect with drive current i rightabout (other direction) induced current Ik time, interval T2R is the interval of rotary state of judging the initial positive direction region b of the rotor 202 in the 3rd quadrant III, and interval T3R is the interval of rotary state of judging the initial opposite direction region c of the rotor 202 in the 3rd quadrant III.

Under the state of the large rotation of the surplus that main driving pulse P1 pulse is declined, when detect with drive current i equidirectional (direction) induced current Ik time, interval T1b is the interval of rotary state of judging the initial positive direction region b of the rotor 202 in the 3rd quadrant III, and interval T2 is the interval of the rotary state of judging that the initial opposite direction region c of the rotor 202 in the 3rd quadrant III is later.

Adopt a kind of reference voltage V comp as the reference voltage that detects induced voltage signal VRs.

In interval T1b, detect corresponding to drive current i equidirectional flow through the induced voltage signal VRs of the induced current Ik of drive coil 209, corresponding to flowing through in reverse direction the induced voltage signal VRs both sides of the induced current Ik of drive coil 209 with drive current i.

When load corresponding to the energy with main driving pulse P1 becomes large, the rotation of rotor 202 is slack-off, so the generation of induced current Ik postpones constantly.In the case, the induced current Ik producing before interval T1b postpones, and is detected in interval T1b.

; in interval T1b; when load corresponding to the energy with main driving pulse P1 is that predetermined value is when following; rotor 202 is rotated with the speed faster than certain speed; therefore the equidirectional induced current Ik that flows and surpass predetermined value with drive current i do not detected, the induced current Ik that flows with drive current i and surpass predetermined value detected in the other direction.

On the contrary, when load corresponding to the energy with main driving pulse P1 is greater than predetermined value, in interval T1b, the rotary speed of rotor 202 slows to below certain speed, therefore the equidirectional induced current Ik that flows and surpass predetermined value with drive current i detected, the induced current Ik that flows with drive current i and surpass predetermined value do not detected in the other direction.

In this 2nd execution mode, utilize this phenomenon, according to the induced voltage signal VRs over predetermined reference voltage whether detected in the interval T1b of each polarity, be chosen in the direction of the induced current Ik detecting in later span and detect, the judgement, the pulse that are rotated thus situation are controlled.

Like this, according to the induced current Ik over pre-determined reference value whether detected in the initial interval T1b of both sides' polarity, switch in the polarity that detects induced current Ik in interval T2, T2R after interval T1b, T3R (detection side to) and detect, according to the induced current Ik in above-mentioned each interval T1b, T2, T2R, T3R (being actually the induced voltage signal VRs with induced current Ik equivalence), detect the rotary state of stepping motor 107.Therefore, even in the situation that load rotation large, rotor 202 is slower, also can the rotation of rotor 202 faster the stage be rotated detection, can reduce the impact of load change and rotate accurately detection.

In addition, in initial interval T1b in the situation that in a side polarity, cannot detect induced current Ik over pre-determined reference value such, rotor 202 is rotated to surpass the speed of certain speed, even if do not switch the direction of induced current Ik, large induced voltage signal VRs can not detected enough yet, so do not switch the direction of induced current Ik, and according to be rotated detection with induced voltage signal VRs corresponding to the equidirectional mobile induced current Ik of main driving pulse P1, can simplify Check processing thus.

Like this, detect the induced current Ik that surpasses fiducial value in interval T1b in both sides' polarity, the detected object after switching in interval, improves rotation accuracy of detection thus.

Figure 10 is the process decision chart of concluding the pulse control action in the present invention's the 2nd execution mode.

Interval T1b, T2 are that interval T2R, T3R make detection side to becoming the direction contrary with interval T2, detect the interval of induced current Ik in the interval of equidirectional detection when mobile of drive current i and induced current Ik.The width of interval T2 is identical with the summation of the width of interval T2R, interval R3.

As mentioned above, situation about detecting over the induced voltage signal VRs of reference voltage V comp is expressed as to decision content " 1 ", situation about not detecting over the induced voltage signal VRs of reference voltage V comp is expressed as to decision content " 0 "." 1/0 " represents that decision content can be any one in " 1 ", " 0 ".In addition, "-" represents not to be thought of as the pattern of induced voltage signal VRs.

Rotation detection circuit 108 detects and has or not the induced voltage signal VRs over reference voltage V comp, and between detection zone, decision circuit 109 is judged the pattern (degree more than needed that represents the energy of main driving pulse P1 of induced voltage signal VRs.), control circuit 103 is with reference to the process decision chart that is stored in Figure 10 of control circuit 103 inside, according to above-mentioned pattern, carry out the pulses described later such as driving of pulse rising, pulse decline or the corrected drive pulse P2 of main driving pulse P1 and control, stepping motor 107 is rotated to control.

Figure 11 is the part detailed circuit diagram of using in the stepping motor control circuit of the present invention's the 2nd execution mode, movement and analog electronic clock, is the part detailed circuit diagram of motor-drive circuit 106 and rotation detection circuit 108.The part identical with Fig. 5 marked to same label.

Possess for detection of the comparator 310 of the induced signal VRs of generation on detection resistance 301, for detection of the comparator 311 that is detecting the induced signal VRs producing on resistance 302.Comparator the 310, the 311st, the inscape of rotation detection circuit 108.

As the reference voltage of each comparator 310,311, input identical baseline threshold voltage Vcomp.When the induced voltage signal VRs detecting at the detection resistance 301,302 by corresponding surpasses baseline threshold voltage Vcomp, comparator 310,311 is exported decision content " 1 " as detection signal, when induced voltage signal VRs does not surpass baseline threshold voltage Vcomp, using decision content " 0 " as detection signal Vs, export.Between detection zone, decision circuit 109 is selected the output of the comparator 310,311 corresponding with the direction of the induced current Ik of detection, judges and exports each interval decision content.

Figure 12 is the sequential chart of the present invention's the 2nd execution mode, the sequential chart that is the detection side of not switching induced current Ik when detecting.Sequential chart when Figure 12 is the state of the driving that load increment is little (rotation that surplus is large), is illustrated in the sequential while detecting under the mobile state of induced current Ik and the same direction of drive current i.In the case, utilize the pattern of the decision content of the induced signal VRs in the 1st interval T1b and the 4th interval T2 to judge rotary state.

In the situation that stepping motor 107 is rotated to driving, ON-OFF control circuit 303 drive period P 1 constantly ta～tb during, under the state of transistor Q3 conducting, make transistor Q2 according to predetermined period conducting state (supply condition) and cut-off state (supply halted state) and carry out switch motion repeatedly, generate thus the main driving pulse P1 of comb teeth-shaped, the drive current i of Figure 11 direction of arrow is provided to the drive coil 209 of stepping motor 107.Thereby the in the situation that of stepping motor 107 rotation, rotor 202 is to positive direction Rotate 180 degree.

In the detection of rotary state, first, in the interval T1 since moment tb (interval to interval T1b additional mask after interval T1a), detect the induced signal VRs of both sides' polarity.In the case, ON-OFF control circuit 303 makes under the state of transistor Q1, Q2 cut-off, control each transistor Q1～Q6, following state repeatedly alternately: (1) the 1st detected state, transistor Q3, Q6 are become under the state of conducting state, make transistor Q4 with conducting state and cut-off state, carry out switch motion according to predetermined period, make thus induced current Ik and drive current i flow through detection resistance 302 equidirectionally and detect; (2) the 2nd detected states, at transistor Q4, Q5, become under the state of conducting state, make transistor Q3 with conducting state and cut-off state, carry out switch motion according to predetermined period, make thus induced current Ik and drive current i flow through in reverse direction detection resistance 301 and detect.

Thus, under the 1st detected state, on detection resistance 302, produce induced voltage signal VRs, under the 2nd detected state, on detection resistance 301, produce induced voltage signal VRs.

311 pairs of comparators compare at the induced voltage signal VRs and the reference voltage V comp that detect generation on resistance 302, when induced voltage signal VRs surpasses reference voltage V comp, " 1 " is exported to decision circuit between detection zone 109 as detection signal Vs, when not surpassing, " 0 " is exported to decision circuit between detection zone 109 as detection signal Vs.

In addition, 311 pairs of comparators compare at the induced voltage signal VRs and the reference voltage V comp that detect generation on resistance 301, when induced voltage signal VRs surpasses reference voltage V comp, " 1 " is exported to decision circuit between detection zone 109 as detection signal Vs, when not surpassing, " 0 " is exported to decision circuit between detection zone 109 as detection signal Vs.

Between detection zone, decision circuit 109 is ignored the induced voltage signal VRs in T1a between blind zone and is not judged, but carries out the judgement of the induced voltage signal VRs in interval T1b.

In a polarity OUT1, decision content is " 0 ", and in another polarity OUT2, decision content is " 1 ", so decision circuit 109 detects and the equidirectional mobile induced current Ik of drive current i in interval below between detection zone.That is, between detection zone, decision circuit 109 judges the induced voltage signal VRs over baseline threshold voltage Vcomp in interval T2, whether to be detected.

In the case, from the 109 input detection signal Vs of decision circuit between comparator 310,311 twocouese detection zones, but between detection zone, decision circuit 109 only determines whether and belongs to interval T2 the detection signal Vs from comparator 311 in interval T2.Thus, can be rotated more accurately the judgement of situation.In addition because not the detection side of switched energization electric current I k to, so it is simple to detect action.

The pattern (decision content in the decision content in interval T1b, interval T2) that between detection zone, decision circuit 109 is exported induced voltage signal VRs to control circuit 103 is as its result of determination.

Control circuit 103, according to the pattern from decision circuit between detection zone 109, is judged the rotary state of stepping motor 107 with reference to the process decision chart of Figure 10, carry out the driving isopulse of pulse decline, pulse rising+corrected drive pulse P2 and control.

After the circulation shown in Figure 12 finishes, in next circulation, the polarity of the induced voltage signal VRs also detecting in the interval after interval T1 according to the induced voltage signal VRs decision of both sides' polarity in interval T1b, is rotated and detects action.

Figure 13 is the sequential chart of the present invention's the 2nd execution mode, the sequential chart that is the detection side of switching induced current Ik when detecting, the sequential when state of the driving that load increment is large (rotation that surplus is little) is shown.In Figure 13, in interval T2R, T3R, for the detection side of induced current Ik is detected to switching in the other direction, the polarity of upset induced voltage signal VRs detects.Thus, as shown in Figure 12, be configured to and be not to detect in the c of the region of time delay, but can in the b of the region of time advance, detect induced voltage signal VRs, even in the situation that rotation is slower, also can be rotated more accurately detection.

That is, in Figure 13, same with Figure 12, after stepping motor 107 being rotated to driving during moment ta～tb, in the interval T1 since moment tb (the interval T1b of interval T1a+), detect the induced signal VRs of both sides' polarity.

In a polarity OUT1, decision content is " 1 ", in another polarity OUT2, decision content is " 0 ", thus between detection zone decision circuit 109 after interval in detect the mobile induced current Ik in the other direction with drive current i.That is, between detection zone, decision circuit 109 judges the induced voltage signal VRs over baseline threshold voltage Vcomp in interval T2R, interval T3R, whether to be detected.

In the case, from the 109 input detection signal Vs of decision circuit between comparator 310,311 twocouese detection zones, but between detection zone, decision circuit 109 only determines whether and belongs to interval T2R, TR3 the detection signal Vs from comparator 310 in interval T2R, TR3.Thus, detect in early days rotary state, so can judge more accurately rotary state.

The pattern (decision content in the decision content in interval T1b, interval T2R, the decision content in interval T3R) that between detection zone, decision circuit 109 is exported induced voltage signal VRs to control circuit 103 is as its result of determination.

Control circuit 103, according to the pattern from decision circuit between detection zone 109, is judged the rotary state of stepping motor 107 with reference to the process decision chart of Figure 10, maintain, pulse rising isopulse controls.

In Figure 13, ON-OFF control circuit 303 is moved in the interval (the 3rd interval T2R, the 4th interval T3R) after interval T1b, and the detection side of induced current Ik is detected to the direction switching to contrary before this.The time width sum of interval T2R, interval T3R is identical with interval T2.

In interval T2R, T3R, ON-OFF control circuit 303 becomes conducting state at transistor Q4, Q5, transistor Q6 becomes under the state of cut-off state, make transistor Q3 with conducting state and cut-off state, carry out switch motion according to predetermined period, make thus induced current Ik flow through and detect resistance 301.On detection resistance 301, produce detection side to the induced voltage signal VRs contrary with interval T1b, carry out detection side to the detection that is switched to reciprocal induced current Ik.Thus, detect the induced voltage signal VRs producing in the b of region.

310 couples of induced voltage signal VRs of comparator and reference voltage V comp compare, when induced voltage signal VRs surpasses reference voltage V comp, " 1 " is exported to decision circuit between detection zone 109 as detection signal Vs, when not surpassing, " 0 " is exported to decision circuit between detection zone 109 as detection signal Vs.

In addition, 311 couples of induced voltage signal VRs of comparator and reference voltage V comp compare, when induced voltage signal VRs surpasses reference voltage V comp, " 1 " is exported to decision circuit between detection zone 109 as detection signal Vs, when not surpassing, " 0 " is exported to decision circuit between detection zone 109 as detection signal Vs.

Between detection zone, decision circuit 109 is according to the detection signal from comparator 310, and pattern (decision content of the decision content in interval T1b, the decision content of interval T2R, interval T3R) from induced voltage signal VRs to control circuit 103 that export is as its result of determination.

Control circuit 103, according to the pattern from decision circuit between detection zone 111, is judged the rotary state of stepping motor 107, maintains, pulse rising isopulse controls.

Like this, when be judged to be energy rotation less, rotor 202 with the corresponding main driving pulse P1 that loads when slower according to the exciting current Ik of both sides' polarity OUT1, OUT2 in interval T1b, in interval after interval T1, the detection side of induced current Ik is detected to switching to rightabout, be rotated the judgement of situation, can in the stage (the rotary area b of rotor 202), be rotated detection faster in the rotation of rotor thus, so can detect more accurately rotary state.

After the circulation shown in Figure 13 finishes, also the polarity of the induced voltage signal VRs detecting determine the interval after interval T1 according to the induced voltage signal VRs of both sides' polarity in interval T1b in next circulation in, to each transistor, Q1～Q6 drives control, to be rotated, detects action.

Figure 14 is the flow chart of the action of stepping motor control circuit, movement and analog electronic clock that the present invention's the 2nd execution mode is shown, is the flow chart that the processing of control circuit 103 is mainly shown.To carrying out, mark same label with the part of the processing of the same content of Fig. 8.

Below, with reference to Fig. 1, Fig. 2, Fig. 9～Figure 14, explain the action of the present invention's the 2nd execution mode.

103 pairs of control circuits come the clock and watch signal of self frequency-dividing circuit 102 to count to implement timing action, first, by the energy grade n of main driving pulse P1n and represent that the count value N of the Continuous Drive number of times of same main driving pulse P1 is reset to 0 (the step S501 of Figure 14).

Control circuit 103 carries out initial setting, so that rotation detection circuit 108 is according to being rotated detection (being made as Rs-N) (step S502) with the equidirectional mobile induced current Ik of drive current i (in other words, induced voltage signal VRs).

Rotation detection circuit 108 detect have or not with drive current i equidirectional flow and surpass the induced current Ik of pre-determined reference value.In other words, rotation detection circuit 108 judges the induced voltage signal VRs that surpasses predetermined reference voltage V comp in interval T1b, whether to be detected.That is, rotation detection circuit 108 is first as illustrated in Figure 12, Figure 13, drive so that induced current Ik and drive current i flow equidirectionally, and detect induced voltage signal VRs.Control circuit 103 judges whether rotation detection circuit 108 detects the induced voltage signal VRs (step S505) over reference voltage V comp.

When being judged to be the induced signal VRs not detecting over reference voltage V comp in treatment step S505, in control circuit 103 interval afterwards as shown in Figure 12, control rotation detection circuit 108, the detection side who does not change and maintain induced current Ik to, and determine whether the induced voltage signal VRs detecting over reference voltage V comp.Between detection zone, decision circuit 109 judges whether rotation detection circuit 108 detects the induced voltage signal VRs over reference voltage V comp in interval T2.

Control circuit 103 judges the induced voltage signal VRs (step S506) over reference voltage V comp in interval T2, whether to be detected, when being judged to be the induced voltage signal VRs not detecting over reference voltage V comp in interval T2, after carrying out the processing for the treatment of step S508～S511, be back to treatment step S502.

When being judged to be the induced voltage signal VRs detecting over reference voltage V comp in interval T2 in treatment step S506, control circuit 103, after carrying out the processing for the treatment of step S530～S534, is back to treatment step S502.

On the other hand, when being judged to be rotation detection circuit 108 the induced voltage signal VRs over reference voltage V comp detected in treatment step S505, control circuit 103 is controlled as follows: as shown in Figure 13, make rotation detection circuit 108 that the detection side of induced current Ik (in other words, induced voltage signal VRs) is rotated to detection (being made as Rs-R) (step S522) in the other direction to switching to.

After, rotation detection circuit 108 as shown in Figure 13, in interval T2R, T3R, change detection resistance 301,302, thus by the detection side of induced current Ik to switching in the other direction, detect and have or not the induced voltage signal VRs over reference voltage V comp.Between detection zone, decision circuit 109 judges whether the induced voltage signal VRs that surpasses reference voltage V comp that rotation detection circuit 108 detects belongs to interval T2R, T3R, to the pattern of control circuit 103 output induced voltage signal VRs.

That is,, when being judged to be the induced voltage signal VRs that detects surpassing reference voltage V comp in interval T1b, control circuit 103 judges the induced voltage signal VRs (step S525) over reference voltage V comp in interval T2R, whether to be detected.

When being judged to be the induced voltage signal VRs not detecting over reference voltage V comp in interval T2R in treatment step S525, control circuit 103 judges the induced voltage signal VRs (step S526) over reference voltage V comp in interval T3R, whether to be detected.

When being judged to be the induced voltage signal VRs not detecting over reference voltage V comp in interval T3R in treatment step S526, control circuit 103 is after carrying out the processing for the treatment of step S508～SS511, be back to treatment step S502, when being judged to be the induced voltage signal VRs detecting over reference voltage V comp in interval T3R, control circuit 103, after carrying out the processing for the treatment of step S509～S511, is back to treatment step S502.

When being judged to be the induced voltage signal VRs detecting over reference voltage V comp in interval T2R in treatment step S525, control circuit 103 is transferred to treatment step S531.

As previously discussed, the stepping motor control circuit of the present invention's the 2nd execution mode is characterised in that, possess: rotation test section, it detects the induced current that flows through drive coil due to the free vibration of stepping motor in being divided between the detection zone in a plurality of intervals, utilization is along with the relative load with respect to driving-energy increases, the described faradic situation that constantly produces delay and described faradic level reduction that detects, according to being illustrated in described each interval the faradic pattern over pre-determined reference value whether detected, detect the rotary state of described stepping motor, and control part, it selects driving pulse corresponding to rotary state detecting with described rotation test section from the mutually different multiple driving pulse of energy, utilize the driving pulse of described selection to provide drive current to described drive coil, described stepping motor is rotated to driving, described rotation test section has described drive coil is flow through in detection each other in reverse direction faradic the 1st detecting element due to the free vibration of described stepping motor, the 2nd detecting element, and between described detection zone, by the drive coil that makes to comprise described stepping motor and the 1st closed circuit of described detecting element and the 2nd closed circuit being formed by described drive coil and low impedance element, repeatedly replace to detect described induced current, according to using described the 1st detecting element in initial the 1st interval interval T1b of the conduct between described detection zone, the 2nd detecting element detects described induced current and the result that obtains, be selected in the detecting element using in the described the 1st interval interval afterwards and detect, according to the described faradic pattern based on detecting in described each interval, detect the rotary state of described stepping motor.

Here, between above-mentioned detection zone, be divided into the 1st interval T1b after utilizing driving pulse to drive, the 2nd interval T2R after the 1st interval T1b, the 3rd interval T3R after the 2nd interval T2R, and maintaining the grade of main driving pulse P1 and under the state of Driving Stepping Motor 107, the 1st interval T1b is the interval of rotary state of judging the initial positive direction of the rotor 202 in the 2nd quadrant II in the space centered by the rotor 202 of stepping motor 107, the 2nd interval T2R is the interval of rotary state of judging the initial positive direction of the rotor 202 in the 3rd quadrant III, the 3rd interval T3R is the interval of judging the initial reciprocal rotary state of the rotor 202 in the 3rd quadrant III, when detecting with the reciprocal induced current Ik over predetermined value of drive current i, above-mentioned rotation test section carries out the detection with the equidirectional induced current Ik of drive current i after the 2nd interval T2R, be rotated the judgement of situation.

In addition, above-mentioned rotation test section can be configured to, when detecting with the reciprocal induced current Ik over predetermined value of drive current i, the 2nd interval T2R and the 3rd interval T3R are carried out to the detection of induced current Ik as 1 the 4th interval T2 merging, pattern according to the induced current Ik detecting in the 1st interval T1b and the 4th interval T2, is rotated the judgement of situation.

In addition, the 1st interval T1b of T after being divided into and utilizing driving pulse to drive between detection zone, the 2nd interval T2R after the 1st interval T1b, the 3rd interval T3R after the 2nd interval T2R, maintaining the grade of driving pulse, drive under the state of above-mentioned stepping motor, the 1st interval T1b is the interval of rotary state of judging the initial positive direction of the rotor 202 in the 2nd quadrant II in the space centered by the rotor 202 of stepping motor 107, the 2nd interval T2R is the interval of rotary state of judging the initial positive direction of the rotor 202 in the 3rd quadrant III, the 3rd interval TR3 is the interval of judging the initial reciprocal rotary state of the rotor 202 in the 3rd quadrant III, when detecting with the equidirectional induced current Ik over predetermined value of drive current i, above-mentioned rotation test section carries out the detection with the reciprocal induced current Ik of drive current i after the 2nd interval T2R, be rotated the judgement of situation.

In addition, above-mentioned rotation test section can be configured to, and when detecting with the equidirectional induced current Ik over predetermined value of drive current i, is rotated the judgement of situation according to the pattern of the induced current Ik detecting in the interval T3R of the 1st interval T1b to the 3.

Like this, in the 2nd execution mode of the present invention, for the change that drives surplus energy (size of the load relative with driving-energy), according to the induced signal VRs of two polarity (out1,2) in interval T1b, select suitable rotation to detect the sense of current, realize high-precision rotation and judge.

Therefore, not only play the effect same with above-mentioned the 1st execution mode, can also in the region b by the spinner velocity maximum after driving pulse P1 disconnects, detect, acquisition is compared high level more and stable induced signal VRs with detecting in the c of region, thereby can obtain, is not subject to the impact of load change, stable detection performance.

In addition, rotation after just having disconnected by driving pulse P1 detects, there is effect as follows: be not vulnerable to the impact of load change, realize according to the generation that surpasses the induced signal VRs of predetermined level and constantly judge that the precision of the control action that drives surplus improves, and can reduce meaningless power consumption.

Then, the 3rd execution mode of the present invention is described.

In the 1st execution mode of the present invention, be configured to, by detecting the induced signal VRs of folk prescription polarity in the initial interval T1 fixing at time width, judge rotary state, according to the result of this judgement, select the direction of induced current Ik to be rotated detection.In the 3rd execution mode of the present invention, be configured to, by detecting the induced signal VRs of folk prescription polarity in the initial interval changing at time width, judge rotary state, according to the result of this judgement, select the direction of induced current Ik to be rotated detection.In addition, be similarly configured to the 1st execution mode, adopt two kinds of reference voltage V inv, Vcomp as reference voltage.

Thus, even in the situation that the driving-energy relative reduction corresponding with load also can be grasped rotary state exactly, the rotation of carrying out reliably in the b of region detects, rather than the detection of the rotation in the c of region, thereby can rotate accurately detection.

Figure 15 is the sequential chart while utilizing main driving pulse P1 Driving Stepping Motor 107 in the 3rd execution mode of the present invention.Figure 15 is the state of (utilizing main driving pulse P1 to take the needle while driving to moment pointer 114～116 in the situation that the supply voltage of analog electronic clock is rated voltage) while conventionally driving.

Drive the scheduled period after finishing to be made as for detection of T between the detection zone of rotary state main driving pulse P1, T between detection zone is divided into continuous a plurality of intervals.Detect with in the situation that flow through the equidirectional induced current Ik of drive current i of drive coil 209 while utilizing main driving pulse P1 to drive, use the 5th interval T1a, the 6th interval T1b, these 3 intervals of the 4th interval T2, in addition, detect with in the situation that flow through the reciprocal induced current Ik of drive current i of drive coil 209 while utilizing main driving pulse P1 to drive, use the 5th interval T1a, the 6th interval T1b, these 4 intervals of the 2nd interval T2R, the 3rd interval T3R.

The time width of interval T1a is fixed as steady state value.The time width of interval T1b changes according to the induced signal VRs detecting, but its maximum duration width is set to predetermined value.The time width of interval T3R is fixed as preset width.In addition, the time width sum of interval T1b, interval T2R and the 3rd interval T3R is configured to the time width of interval T2 and equates.Interval T1a and interval T1b form interval T1.Between detection zone, the time width of T is configured to and does not change.In addition in this 3rd execution mode, do not arrange between blind zone.

In the situation that centered by rotor 202, residing XY coordinate space is divided into the 1st quadrant I～4th quadrant IV with the rotation of rotor 202 for the magnetic pole shaft A of rotor 202, interval T1, T1a, T1b, T2, T2R, T3R can be expressed as follows.

For example, not changing, maintain under the state of the driving (rotation that surplus is little) that the load increment of grade of main driving pulse P1 is large, interval T1a and interval T1b are the intervals of rotary state of judging the initial positive direction region a of the rotor 202 in the 2nd quadrant II, interval T2R judges the rotary state of initial positive direction region a of rotor 202 in the 2nd quadrant II and the interval of the rotary state of the initial positive direction region b of the rotor 202 in the 3rd quadrant III, interval T3R judges the rotary state of initial positive direction region b of rotor 202 in the 3rd quadrant III and the interval of the rotary state of the initial opposite direction region c of the rotor 202 in the 3rd quadrant III.

In addition, (surplus is rotated greatly in the little driving of load increment declining in the grade that makes main driving pulse P1, do not adopt interval T1b) state under, interval T1a is the interval of rotary state of judging the initial positive direction region b of the rotor 202 in the 3rd quadrant III, and interval T2 is the interval of judging the rotary state of initial positive direction region b of the rotor 202 in the 3rd quadrant III and the later rotary state of the initial opposite direction region c of the rotor 202 in the 3rd quadrant III.

Same with above-mentioned the 1st execution mode, adopt predetermined two kinds of reference voltage V inv, Vcomp as the reference voltage that detects induced voltage signal VRs.The situation and the situation equivalence that the induced current Ik that surpasses the 1st fiducial value detected of the induced voltage signal VRs that surpasses the 1st reference voltage V inv detected, in addition, the situation and the situation equivalence that the induced current Ik that surpasses the 2nd fiducial value detected of the induced voltage signal VRs that surpasses the 2nd reference voltage V comp detected.The 2nd fiducial value is greater than the 1st fiducial value, and in addition, the 2nd reference voltage V comp is set to the value that is greater than the 1st reference voltage V inv.The 1st reference voltage V inv is the benchmark of judging the surplus degree of driving-energy, and be the reference voltage while being rotated detection according to the induced current Ik with drive current i opposite polarity, the 2nd reference voltage V comp is the reference voltage while being rotated detection according to the induced current Ik with drive current i same polarity.

In interval T1a, T1b, carry out rotation based on reference voltage V inv and judge, according to testing result select detection side to and reference voltage be rotated detection.

For example, when a plurality of induced signal VRs in interval T1a do not surpass reference voltage V inv, detection is corresponding to the induced signal VRs of the induced current Ik of the drive current i same current direction with main driving pulse P1, in order to carry out reliably irrotational judgement, use higher reference voltage V comp to judge.That is the rotation of, carrying out in interval T2 detects.In the case, in the example of Figure 15, become surplus and rotate greatly, make main driving pulse P1 carry out pulse decline.

When in interval T1a, detect over reference voltage V inv a plurality of induced signal VRs time, continue to detect, until produce the induced signal VRs lower than reference voltage V inv.When a plurality of induced signal VRs in interval T1a are over reference voltage V inv, afterwards when interval T1a internal induction signal VRs no longer surpasses reference voltage V inv or when interval T1b internal induction signal VRs no longer surpasses reference voltage V inv, in the interval T1a finish time or induced signal VRs, no longer surpass the moment of reference voltage V inv, the rotation that switches to the reciprocal induced current Ik of drive current i based on main driving pulse P1 detects, and uses reference voltage V inv to be rotated detection.That is the rotation of, carrying out in interval T2R, interval T3R detects.In the case, in the example of Figure 15, become the medium rotation of surplus, make main driving pulse P1 carry out pulse decline.

When in interval T1a, detect over reference voltage V inv a plurality of induced signal VRs time, the in the situation that in the Zone Full of interval T1a, induced signal VRs surpassing reference voltage V inv, in interval T1b, induced signal VRs also surpasses reference voltage V inv, in interval T1b, detect, until produce the induced signal VRs lower than reference voltage V inv.When in interval T1b, produce lower than reference voltage V inv induced signal VRs time, carve at this moment, use reference voltage V inv, the rotation that switches to the reciprocal induced current Ik of drive current i based on main driving pulse P1 detects.That is the rotation of, carrying out in interval T2R, interval T3R detects.In the case, in the example of Figure 15, become the rotation that surplus is little, maintain main driving pulse P1.

When in interval T1a, detect over reference voltage V inv a plurality of induced signal VRs time, in the Zone Full of interval T1a induced signal VRs surpass reference voltage V inv, in the situation that in the Zone Full of interval T1b induced signal VRs also surpass reference voltage V inv, the moment finishing at the Breadth Maximum of interval T1b, use reference voltage V inv, the rotation that switches to the reciprocal induced current Ik of drive current i based on main driving pulse P1 detects.That is the rotation of, carrying out in interval T2R, interval T3R detects.In the case, in the example of Figure 15, become the rotation that surplus is little, make main driving pulse P1 carry out pulse rising.In addition, set the Breadth Maximum of interval T1b for preset width and as the 7th interval.In addition, the maximum length of the time width sum of interval T1a and interval T1b is made as to below 1/2 of T between detection zone.

Figure 16 is the process decision chart of concluding the pulse control action in the present invention's the 3rd execution mode.

Interval T1a, T1b, T2 are that interval T2R, T3R detect detection side the interval of induced current Ik to being made as the direction contrary with interval T2 in drive current i and the equidirectional interval of detecting when mobile of induced current Ik.

Rotation detection circuit 108 detects and has or not the induced voltage signal VRs over reference voltage V comp, and between detection zone, decision circuit 109 is judged the pattern (degree more than needed that represents the energy of main driving pulse P1 of induced voltage signal VRs.), control circuit 103 is with reference to the process decision chart that is stored in Figure 16 of control circuit 103 inside, according to above-mentioned pattern, carry out the pulses described later such as driving of pulse rising, pulse decline or the corrected drive pulse P2 of main driving pulse P1 and control, stepping motor 107 is rotated to control.

Figure 17 is the sequential chart of the present invention's the 3rd execution mode, the sequential chart that is the detection side of not switching induced current Ik when detecting.Sequential chart when Figure 17 is the state of the driving that load increment is little (surplus is rotated greatly), is illustrated in the sequential while detecting under the equidirectional mobile state of induced current Ik and drive current i.In the case, according to the pattern of the decision content of the induced signal VRs in interval T1a and interval T2, judge rotary state.

In the situation that stepping motor 107 is rotated to driving, ON-OFF control circuit 303 drive period P 1 constantly ta～tb during, under the state of transistor Q3 conducting, make transistor Q2 according to predetermined period conducting state (supply condition) and cut-off state (supply halted state) and carry out switch motion repeatedly, generate thus the main driving pulse P1 of comb teeth-shaped, the drive current i of Fig. 5 direction of arrow is provided to the drive coil 209 of stepping motor 107.Thereby the in the situation that of stepping motor 107 rotation, rotor 202 is to positive direction Rotate 180 degree.

; in the interval T1a since moment tb; ON-OFF control circuit 303 becomes under the state of conducting state at transistor Q3, Q6; make transistor Q4 with conducting state and cut-off state, carry out switch motion according to predetermined period, make thus induced current Ik and drive current i flow through equidirectionally and detect resistance 302.Thereby produce induced voltage signal VRs on detection resistance 302.

In addition, inverter 305 is when induced voltage signal VRs surpasses the 1st reference voltage V inv, and output " 0 ", when not surpassing, output " 1 ", NAND circuit 307 will make signal " 1 " or " 0 " after its upset export to decision circuit between detection zone 109 as detection signal Vs.

Between detection zone, decision circuit 109 is according to the detection signal Vs with NAND circuit 307 from comparator 304, whether judgement detects a plurality of induced voltage signal VRs (in the present embodiment, being at least 2 induced voltage signal VRs that surpass the 1st reference voltage V comp) over predetermined reference voltage in interval T1a.

In the example of Figure 17, because a plurality of induced voltage signal VRs that surpass predetermined reference voltage V inv do not detected in interval T1a, so the ON-OFF control circuit 303 of rotation detection circuit 108 in interval T2, does not change the flow direction of induced current Ik yet and detects action.Therefore, in interval T2, also each transistor is driven to control, to carry out action same as described above.

Now, in interval T2, only adopting is not to use the 1st reference voltage V inv but the decision content of the induced voltage signal VRs that use the 2nd reference voltage V comp judges.That is, from the 109 input detection signal Vs of decision circuit between NAND circuit 307 and comparator 304 twocouese detection zones, but between detection zone, decision circuit 109 only determines whether and belongs to interval T2 the detection signal Vs from comparator 304 in interval T2.Thus, even the irrotational situation over a plurality of induced voltage signal VRs of predetermined reference voltage Vinv do not detected in interval T1a, by adopting the 2nd higher reference voltage V comp of level to judge, non-rotating erroneous judgement can be decided to be to rotation, thereby can be rotated more accurately the judgement of situation.In addition because not the detection side of switched energization electric current I k to, so it is simple to detect action.

The pattern (decision content of the decision content of interval T1a, the decision content of interval T1b, interval T2) that between detection zone, decision circuit 109 is exported induced voltage signal VRs to control circuit 103 is as its result of determination.

Control circuit 103, according to the pattern from decision circuit between detection zone 109, is judged the rotary state of stepping motor 107 with reference to the process decision chart of Figure 16, carry out pulse rising isopulse and control.

After the circulation shown in Figure 17 finishes, in next circulation, when in interval T1a, do not detect over predetermined reference voltage Vinv a plurality of induced voltage signal VRs time, to each transistor, Q1～Q6 drives control, to carry out same action.That is, replace transistor Q3 and make transistor Q4 become conducting state, and replace transistor Q2 and make transistor Q1 carry out switch drive according to the cycle identical with transistor Q2, carry out the driving with the main driving pulse P1 of comb teeth-shaped of front circulation opposite polarity.In addition, between detection zone in T, replace transistor Q4 and make transistor Q3 carry out switch motion according to the cycle identical with transistor Q4, replace transistor Q3, Q6 and transistor Q4, Q5 are driven as conducting state.Thus, the rotation of carrying out based on induced current Ik detects.

On resistance 301, produce the induced voltage signal VRs that the rotation due to stepping motor 107 produces detecting, comparator 304 is exported using the result that induced voltage signal VRs and the 2nd reference voltage V comp are compared as detection signal Vs to decision circuit between detection zone 109.In addition, 306 couples of induced voltage signal VRs of inverter and the 1st reference voltage V inv compare, according to comparative result output " 1 " or " 0 ", NAND circuit 307 will make signal " 0 " or " 1 " after its upset export to decision circuit between detection zone 109 as detection signal Vs.

When in interval T1a, do not detect over predetermined reference voltage Vinv a plurality of induced voltage signal VRs time carry out above-mentioned same action, in interval T2, same with front circulation, between detection zone, decision circuit 109 only carries out interval judgement to the detection signal Vs from comparator 304.

Between detection zone, decision circuit 109 outputs to control circuit 103 by the pattern of induced voltage signal VRs (decision content of the decision content of interval T1a, the decision content of interval T1b, interval T2).

Control circuit 103, according to the pattern from decision circuit between detection zone 109, is judged the rotary state of stepping motor 107, carries out pulse rising isopulse and controls.

When in interval T1a, do not detect over predetermined reference voltage Vinv a plurality of induced voltage signal VRs time, alternately above-mentioned 2 circulations repeatedly, carry out thus the rotation of stepping motor 107 and control.In addition, in irrotational situation, carry out the driving of corrected drive pulse P2, in the case, be not rotated and detect action.

Figure 18 is the sequential chart of the present invention's the 3rd execution mode, the sequential chart that is the detection side of switching induced current Ik when detecting, the sequential when state of the driving that load increment is large (rotation that surplus is little) is shown.In Figure 18, in interval T2R, T3R, for the detection side of induced current Ik is detected in the other direction to switching to, make the polarity upset of induced voltage signal VRs and detect.Thus, be configured to as shown in Figure 17 and be not to detect in the c of the region of time delay, but can in the b of the region of time advance, detect induced voltage signal VRs, thereby even in the situation that rotation is slower, also can be rotated more accurately detection.

In the situation that stepping motor 107 is rotated to driving, ON-OFF control circuit 303 drive period P 1 constantly ta～tb during, under the state of transistor Q3 conducting, make transistor Q2 according to predetermined period repeatedly conducting state (supply condition) and cut-off state (supply halted state) carry out switch motion, utilize thus the main driving pulse P1 of comb teeth-shaped that the drive current i of Fig. 5 direction of arrow is provided to the drive coil 209 of stepping motor 107.Thereby the in the situation that of stepping motor 107 rotation, rotor 202 is to positive direction Rotate 180 degree.

Between detection zone, decision circuit 109 is according to the detection signal Vs with NAND circuit 307 from comparator 304, whether judgement detects a plurality of induced voltage signal VRs (in the present embodiment, being at least 2 induced voltage signal VRs that surpass the 1st reference voltage V inv) over predetermined reference voltage in interval T1a.That is, between detection zone, decision circuit 109 judges that in interval T1a whether the rotation of rotor 202 is slower than fixing speed.

In the example of Figure 18, because a plurality of induced voltage signal VRs (the slower state of rotation of rotor 202 that surpasses the 1st reference voltage V inv detected in the Zone Full of interval T1a.), so, in the interval T1b of ON-OFF control circuit 303 after interval T1a, also use the 1st reference voltage V inv to move, with the detection side that do not change induced current Ik to and detect.Thus, the induced signal over reference voltage V inv in interval T1b, detected.

In interval T1b, when the level of induced signal VRs becomes the 1st reference voltage V inv when following, from then on ON-OFF control circuit 303 constantly starts to move, the detection side of induced current Ik is detected to the direction switching to contrary before this in interval T2R, interval T3R.In this case, in order to improve detection sensitivity, to also can rotate accurately detection in the situation that rotation is slower, use the 1st reference voltage V inv as reference voltage.

In interval T2R, T3R, ON-OFF control circuit 303 becomes conducting state at transistor Q4, Q5, transistor Q6 becomes under the state of cut-off state, make transistor Q3 with conducting state and cut-off state, carry out switch motion according to predetermined period, make thus induced current Ik flow through and detect resistance 301.On detection resistance 301, produce detection side to the induced voltage signal VRs contrary with interval T2, T3, carry out detection side to the detection that is switched to reciprocal induced current Ik.Thus, detect the induced voltage signal VRs producing in the b of region.

The pattern (decision content of interval T1a, the decision content of interval T1b, the decision content of interval T2R, the decision content of interval T3R) that between detection zone, decision circuit 109 is exported induced voltage signal VRs to control circuit 103 is as its result of determination.

Like this, when (also comprising interval T1b in the situation that using interval T1b at interval T1a.) in be judged to be energy rotation less, rotor 202 with the corresponding main driving pulse P1 that loads when slower, in interval after interval T1a, the detection side of induced current Ik is detected to switching in the other direction, be rotated the judgement of situation, can in the stage (the rotary area b of rotor 202), be rotated detection faster in the rotation of rotor thus, so can detect more accurately rotary state.In addition, in the situation that the rotation of rotor 202 level slow, induced voltage signal VRs is lower, a plurality of induced voltage signal VRs (in the present embodiment for surpassing 2 induced voltage signal VRs of the 1st reference voltage V inv) over predetermined reference voltage in interval T1a, also can be detected, so can stablize reliably, be still in the position vertical with the line segment that is connected notch part 204,205, by adopting the 1st reference voltage V inv as lower reference voltage, can carry out rotary state more accurately and judge.

After circulation shown in Figure 18 finishes, in next circulation, when a plurality of induced voltage signal VRs that surpasses a plurality of predetermined reference voltage Vinv, Vcomp being detected in interval T1a, to each transistor, Q1～Q6 drives control, to carry out above-mentioned same action.That is, replace transistor Q3 and make transistor Q4 become conducting state, and replace transistor Q2 and make Q1 carry out switch drive according to the cycle identical with transistor Q2, carry out the driving with the main driving pulse P1 of comb teeth-shaped of front circulation opposite polarity.

Between detection zone in the interval T1a of T, replace transistor Q4 and make transistor Q3 carry out switch motion according to the cycle identical with transistor Q4, replace transistor Q3, Q6 and transistor Q4, Q5 are driven as conducting state.Thus, induced current Ik and drive current i are flow through equidirectionally and detect resistance 301, on detection resistance 301, produce induced voltage signal VRs.Thus, the rotation of carrying out based on the equidirectional mobile induced current Ik of drive current i detects.

In addition, in interval T2R, T3R, replacing transistor Q4, Q5, transistor Q3, Q6 are become under the state of conducting state, replace transistor Q3 and make transistor Q4 with conducting state and cut-off state, carry out switch motion according to predetermined period, make thus induced current Ik flow through and detect resistance 302.On detection resistance 302, produce induced voltage signal VRs, thus, carry out detection side to the detection that is switched to reciprocal induced current Ik.

Same with front circulation, the induced voltage signal VRs producing due to the rotation of stepping motor 107 obtains decision content according to the 1st reference voltage V inv in interval T1a, in addition, in interval T2R, T3R, only according to the 1st reference voltage V inv, obtains decision content.

The pattern (decision content of interval T1a, the decision content of interval T1b, the decision content of interval T2, the decision content of interval T3) that between detection zone, decision circuit 109 is exported induced voltage signal VRs to control circuit 103 is as its result of determination.

Figure 19 is the flow chart of the action of stepping motor control circuit, movement and analog electronic clock that the present invention's the 3rd execution mode is shown, is the flow chart that the processing of control circuit 103 is mainly shown.To carrying out, mark same label with the part of the processing of the same content of Fig. 8.

Below, with reference to Fig. 1, Fig. 2, Fig. 5, Figure 15～Figure 19, describe the action of the present invention's the 3rd execution mode in detail.

103 pairs of control circuits come the clock and watch signal of self frequency-dividing circuit 102 to count, enforcement timing action, first, make the energy grade n of main driving pulse P1n and represent that the count value N of the Continuous Drive number of times of same main driving pulse P1 is reset to 0 (the step S501 of Figure 19).

Control circuit 103 carries out initial setting, and the induced current Ik (in other words, induced voltage signal VRs) that rotation detection circuit 108 bases and drive current i are flowed equidirectionally is rotated detection (being made as Rs-N) (step S502).

Main driving pulse produces circuit 104 in response to the above-mentioned control signal from control circuit 103, to the motor-drive circuit 106 output main driving pulse P10 corresponding with above-mentioned control signal.Motor-drive circuit 106 utilizes main driving pulse P10 to be rotated driving to stepping motor 107.

Rotation detection circuit 108 detect have or not with drive current i equidirectional flow and surpass the induced current Ik of pre-determined reference value.In other words, rotation detection circuit 108 judges a plurality of induced voltage signal VRs that surpass predetermined reference voltage V inv in interval T1a, whether to be detected.That is, rotation detection circuit 108 is first as illustrated in Figure 17, Figure 18, drive so that induced current Ik and drive current i flow equidirectionally, and detect induced voltage signal VRs.Control circuit 103 judges whether rotation detection circuit 108 detects a plurality of induced voltage signal VRs (step S505) over reference voltage V inv.

When being judged to be a plurality of induced signal VRs not detecting over reference voltage V inv in treatment step S505, in control circuit 103 interval T2 afterwards as shown in Figure 17, control rotation detection circuit 108, the detection side who does not change and maintain induced current Ik to, and determine whether the induced voltage signal VRs detecting over reference voltage V comp.In addition, between detection zone, decision circuit 109 judges whether rotation detection circuit 108 detects the induced voltage signal VRs over reference voltage V comp in interval T2.

On the other hand, when being judged to be rotation detection circuit 108 the induced voltage signal VRs over reference voltage V inv detected in treatment step S505, control circuit 103 is controlled as follows: as shown in Figure 18, in interval T2R, T3R, make rotation detection circuit 108 that the detection side of induced current Ik (in other words, induced voltage signal VRs) is rotated to detection (being made as Rs-R) (step S522) in the other direction to switching to.

Rotation detection circuit 108 detects and has or not the equidirectional mobile induced current Ik with drive current i in interval T1b,, detection has or not the induced voltage signal VRs over reference voltage V inv, and between detection zone, decision circuit 109 judges whether the induced voltage signal VRs that surpasses reference voltage V inv that rotation detection circuit 108 detects is included in interval T1b.

Control circuit 103 judges whether rotation detection circuit 108 detects the induced voltage signal VRs (step S191) over reference voltage V inv.

When being judged to be the induced voltage signal VRs not detecting over reference voltage V inv in interval T1b in treatment step S191 (step S191), control circuit 103 judges whether rotation detection circuits 108 detect the induced voltage signal VRs (step S192) over reference voltage V inv in interval T2R.

When being judged to be testing circuit 108 the induced voltage signal VRs over reference voltage V inv do not detected in treatment step S192 in interval T2R, control circuit 103 is transferred to treatment step S530.

When being judged to be testing circuit 108 the induced voltage signal VRs over reference voltage V inv detected in treatment step S192 in interval T2R, control circuit 103 is transferred to treatment step S531.

When being judged to be the induced voltage signal VRs detecting over reference voltage V inv in interval T1b in treatment step S191, control circuit 103 judges the induced voltage signal VRs (step S193) over reference voltage V inv in interval T2R, whether to be detected.

When being judged to be the induced voltage signal VRs detecting over reference voltage V inv in interval T1b in treatment step S193, control circuit 103 is transferred to treatment step S531.

When being judged to be the induced voltage signal VRs not detecting over reference voltage V inv in interval T1b in treatment step S193, control circuit 103 is judged the induced voltage signal VRs (step S194) whether detecting in interval T3R over reference voltage V inv in treatment step S194.

When being judged to be the induced voltage signal VRs not detecting over reference voltage V inv in interval T3R in treatment step S194, control circuit 103 is transferred to treatment step S508 (step S194).

When being judged to be the induced voltage signal VRs detecting over reference voltage V inv in interval T3R in treatment step S194, control circuit 103 is transferred to treatment step S509.

As previously discussed, the stepping motor control circuit of the present invention's the 3rd execution mode is characterised in that, possess: rotation test section, it detects the induced current that flows through drive coil due to the free vibration of stepping motor in being divided between the detection zone in a plurality of intervals, utilization is along with the relative load with respect to driving-energy increases, the above-mentioned faradic situation that constantly produces delay and above-mentioned faradic level reduction that detects, according to being illustrated in the faradic pattern over pre-determined reference value whether detected in above-mentioned each interval, detect the rotary state of above-mentioned stepping motor, and control part, it selects the corresponding driving pulse of rotary state detecting with above-mentioned rotation test section from the mutually different multiple driving pulse of energy, utilize the driving pulse of above-mentioned selection to provide drive current to above-mentioned drive coil, above-mentioned stepping motor is rotated to driving, above-mentioned rotation test section is according to the induced current over pre-determined reference value whether being detected in initial the 1st interval interval of the conduct between above-mentioned detection zone, in interval the above-mentioned the 1st after interval, select faradic detection side to and detect, according to the above-mentioned faradic pattern based on detecting in above-mentioned each interval, detect the rotary state of above-mentioned stepping motor, in the 1st interval T1, from the beginning of the 1st interval T1, be provided with the 5th interval T1a of scheduled time width, above-mentioned rotation test section is according to a plurality of induced current Ik that surpass pre-determined reference value whether detected in the 5th interval T1a, in interval after the 5th interval T1a the detection side of selected induced current Ik to and detect, according to the pattern of the induced current Ik detecting in the interval based on after the 5th interval T1a and the 5th interval T1a, detect the rotary state of stepping motor 107.

Here, above-mentioned rotation test section can be configured to, when a plurality of induced current Ik over said reference value not detected in the 5th interval T1a, the 5th interval T1a is made as to the 1st interval T1, in interval after the 1st interval T1, detection side is detected to induced current Ik to being made as the direction identical with the 1st interval T1, according to the pattern of the induced current Ik detecting in the interval based on after the 1st interval T1 and the 1st interval T1, detect the rotary state of stepping motor 107.

In addition, above-mentioned rotation test section can be configured to, when a plurality of induced current Ik over said reference value being detected in the 5th interval T1a, by after the 5th interval T1a finishes till the interval detecting lower than the induced current Ik of said reference value is made as the 6th interval T1b, in interval after the 6th interval T1b, detection side is detected to induced current Ik to being made as the direction contrary with the 5th interval T1a, according to the pattern of the induced current Ik based on detecting, detect the rotary state of stepping motor 107 in the 5th interval T1a, the 6th interval T1b and other interval.

In addition, above-mentioned rotation test section can be configured to, when a plurality of induced current Ik over said reference value being detected in the 5th interval T1a, in the situation that after the 5th interval T1a finishes till the 7th interval (Breadth Maximum of interval T1b) detecting lower than the induced current of said reference value surpasses scheduled time width, in interval after the 7th interval, detection side is detected to above-mentioned induced current to being made as the direction contrary with the 5th interval T1a, according to based at the 5th interval T1a, the 7th interval and other interval T2R, the pattern of the induced current Ik detecting in T3R, detect the rotary state of stepping motor 107.

In addition, can be configured to, maintaining the grade of main driving pulse P1 under the state of Driving Stepping Motor 107, the 5th interval T1a and the 7th interval are the intervals of rotary state of judging the initial positive direction of the rotor 202 in the 2nd quadrant II in the space centered by the rotor 202 of stepping motor 107.

In addition, above-mentioned rotation test section can be configured to, possess the 1st and detect resistance 301, the 2nd detects resistance 302, they detect and due to the free vibration of stepping motor 107, flow through in reverse direction each other the induced current Ik of drive coil 209, and between detection zone in T, by the drive coil 209 and the detection resistance 301 that make to comprise stepping

motor

107, 302 the 1st closed circuit and the 2nd closed circuit consisting of drive coil 209 and low impedance element replace to detect induced current Ik repeatedly, according to the direction of the induced current Ik detecting, the detecting element that forms the 1st closed circuit is switched to the 1st to be detected resistance 301 or the 2nd detection resistance 302 and detects.

In above-mentioned the 1st execution mode, the interval T1 of the switching of the sense of current of the induced current Ik judge detecting is set as to certain hour width, so cannot obtain suitable switching timing, although rotated may judge by accident be decided to be non-rotating.In this 3rd execution mode, between the detection zone of the switching of the direction of the induced current Ik judge detecting, (T1a+T1b) is so that the position of the rotor 202 of interval T2R while starting becomes the mode of horizontal magnetic pole shaft X changes, so can rotate accurately in early days detection.In addition, after determining the sense of current of induced current Ik, in the suitable moment, be transferred to rotation and detect, so can carry out stable rotation, detect.In addition, can avoid rotating misinterpretation and suppress meaningless power consumption.

In addition, the movement of each execution mode of the present invention has above-mentioned each stepping motor control circuit, so can form the impact that can reduce load change, rotates accurately the analog electronic clock of detection.

In addition, the analog electronic clock of each execution mode of the present invention has above-mentioned each movement, so can reduce the impact of load change, rotates accurately detection, therefore, can realize accurately take the needle, low power consumption.

In addition, in each execution mode of the present invention, T between detection zone is divided into substantially to the example of 3 interval T1～T3, be illustrated, but as long as interval number is a plurality ofly just can apply.

In addition, in each execution mode of the present invention, when a plurality of induced current Ik over a plurality of fiducial values being detected in initial interval T1, in whole intervals after interval T1, make induced current Ik become the direction contrary with interval T1 and flow through drive coil 209 and be rotated detection, but also only make induced current Ik become the direction contrary with interval T1 in the part interval after interval T1, flow through drive coil 209 and be rotated detection.

In addition, the stepping motor control circuit of embodiments of the present invention can also be applied to drive the stepping motor of pointer, calendar parts in addition constantly.

In addition, as the application examples of stepping motor, the electronic watch of take is illustrated as example, but can also be applied to use the electronic equipment of motor.

Industrial utilizability

Stepping motor control circuit of the present invention can be applicable to use the various electronic equipments of stepping motor.

In addition, movement of the present invention and analog electronic clock can be applicable to simulation electronic wrist-watch with calendar function, the various analog electronic clocks that are representative with the various analog electronic clocks with calendar function such as simulation electronic desk clock of calendar function.

Claims

1. a stepping motor control circuit, is characterized in that, this stepping motor control circuit possesses:

Rotation test section, it detects the induced current that flows through drive coil due to the free vibration of stepping motor in being divided between the detection zone in a plurality of intervals, utilization is along with the relative load with respect to driving-energy increases, the described faradic situation that constantly produces delay and described faradic level reduction that detects, according to being illustrated in described each interval the faradic pattern over pre-determined reference value whether detected, detect the rotary state of described stepping motor; And

Control part, it selects driving pulse corresponding to rotary state detecting with described rotation test section from the mutually different multiple driving pulse of energy, utilize the driving pulse of described selection to provide drive current to described drive coil, described stepping motor is rotated to driving

Described rotation test section is according to the induced current over pre-determined reference value whether being detected in initial the 1st interval interval of the conduct between described detection zone, in interval the described the 1st after interval, select faradic detection side to and detect, according to the described faradic pattern based on detecting, detect the rotary state of described stepping motor in described each interval.

2. stepping motor control circuit according to claim 1, is characterized in that,

Described rotation test section is according to a plurality of induced currents that surpass pre-determined reference value whether being detected in the 1st initial interval between described detection zone, in interval the described the 1st after interval, select faradic detection side to and detect, according to the described faradic pattern based on detecting, detect the rotary state of described stepping motor in described each interval.

3. stepping motor control circuit according to claim 2, is characterized in that,

When a plurality of induced current over described pre-determined reference value being detected in described the 1st interval, in the interval of described rotation test section after described the 1st interval, described faradic detection side is detected to switching to the described the 1st interval contrary direction, according to the described faradic pattern based on detecting, detect the rotary state of described stepping motor in described each interval.

4. according to the stepping motor control circuit described in claim 2 or 3, it is characterized in that,

When a plurality of induced current over described pre-determined reference value not detected in described the 1st interval, in the interval of described rotation test section after described the 1st interval, detection side is detected to described induced current to being made as with the described the 1st interval identical direction, according to the faradic pattern based on detecting, detect the rotary state of described stepping motor in described each interval.

5. according to the stepping motor control circuit described in any one in claim 2 to 4, it is characterized in that,

In described the 1st interval, with described drive current and the equidirectional mobile mode of induced current, detect.

6. according to the stepping motor control circuit described in any one in claim 2 to 5, it is characterized in that,

Be provided with the 1st fiducial value and the 2nd fiducial value that is greater than described the 1st fiducial value as fiducial value,

When a plurality of induced current that surpasses described the 1st fiducial value being detected in described the 1st interval, described rotation test section the described the 1st in the interval after interval by described faradic detection side to switching to the direction contrary with described the 1st interval and detecting described induced current according to described the 1st fiducial value.

7. according to the stepping motor control circuit described in any one in claim 2 to 6, it is characterized in that,

When a plurality of induced current that surpasses described the 1st fiducial value not detected in described the 1st interval, described rotation test section the described the 1st in the interval after interval by detection side to being made as the direction identical with described the 1st interval and detecting described induced current according to described the 2nd fiducial value.

8. according to the stepping motor control circuit described in claim 6 or 7, it is characterized in that,

Between described detection zone, be divided into described the 1st interval after utilizing driving pulse to drive, the described the 1st interval the 2nd interval afterwards, the described the 2nd interval the 3rd interval afterwards, and drive under the state of described stepping motor maintaining the grade of driving pulse, described the 1st interval is the interval of rotary state of judging the initial positive direction of the described rotor in the 2nd quadrant in the space centered by the rotor of described stepping motor, described the 2nd interval is to judge the rotary state of initial positive direction of described rotor in the 2nd quadrant and the interval of the rotary state of the initial positive direction of the described rotor in the 3rd quadrant, described the 3rd interval is the interval of judging the initial reciprocal rotary state of the described rotor in the 3rd quadrant,

When a plurality of induced current over described the 1st fiducial value being detected in described the 1st interval, described rotation test section is used described the 1st fiducial value to detect described induced current in described the 2nd interval and the 3rd interval.

9. the stepping motor control circuit described in any one in claim 6 to 8, is characterized in that,

Between described detection zone, be divided into immediately and utilizing 1st interval of driving pulse after driving, the described the 1st interval the 2nd interval afterwards, the described the 2nd interval the 3rd interval afterwards, and drive under the state of described stepping motor maintaining the grade of driving pulse, described the 1st interval is the interval of rotary state of judging the initial positive direction of the described rotor in the 2nd quadrant in the space centered by the rotor of described stepping motor, described the 2nd interval is to judge the rotary state of initial positive direction of described rotor in the 2nd quadrant and the interval of the rotary state of the initial positive direction of the described rotor in the 3rd quadrant, described the 3rd interval is the interval of judging the initial reciprocal rotary state of the described rotor in the 3rd quadrant,

When a plurality of induced current over described the 1st fiducial value not detected in described the 1st interval, described rotation test section is used described the 2nd fiducial value to detect described induced current in described the 2nd interval and the 3rd interval.

10. a stepping motor control circuit, is characterized in that, this stepping motor control circuit possesses:

Rotation test section, it detects the induced current that flows through drive coil due to the free vibration of stepping motor in being divided between the detection zone in a plurality of intervals, utilization is along with the relative load with respect to driving-energy increases, the described faradic situation that delay and described faradic level reduction occur constantly that detects, according to being illustrated in described each interval the faradic pattern over pre-determined reference value whether detected, detect the rotary state of described stepping motor; And

Described rotation test section has described drive coil is flow through in detection each other in reverse direction faradic the 1st detecting element and the 2nd detecting element due to the free vibration of described stepping motor, and between described detection zone, by the drive coil that makes to comprise described stepping motor and the 1st closed circuit of described detecting element and the 2nd closed circuit being formed by described drive coil and low impedance element, repeatedly replace to detect described induced current, according to using described the 1st detecting element in initial the 1st interval interval of the conduct between described detection zone, the 2nd detecting element detects described induced current and the result that obtains, be selected in the detecting element using in the described the 1st interval interval afterwards and detect, according to the described faradic pattern based on detecting in described each interval, detect the rotary state of described stepping motor.

11. stepping motor control circuits according to claim 10, is characterized in that,

Between described detection zone, be divided into described the 1st interval after utilizing driving pulse to drive, the described the 1st interval the 2nd interval afterwards, the described the 2nd interval the 3rd interval afterwards, and drive under the state of described stepping motor maintaining the grade of driving pulse, described the 1st interval is the interval of rotary state of judging the initial positive direction of the described rotor in the 2nd quadrant in the space centered by the rotor of described stepping motor, described the 2nd interval is the interval of rotary state of judging the initial positive direction of the described rotor in the 3rd quadrant, described the 3rd interval is the interval of judging the initial reciprocal rotary state of the described rotor in the 3rd quadrant,

When detecting with the rightabout induced current over predetermined value of drive current, described rotation test section carries out the faradic detection with described drive current equidirectional after described the 2nd interval, is rotated the judgement of situation.

12. stepping motor control circuits according to claim 11, is characterized in that,

When detecting with the rightabout induced current over predetermined value of drive current, described rotation test section is interval and carry out faradic detection as 1 the 4th that merges using described the 2nd interval and the 3rd interval, faradic pattern according to detecting in described the 1st interval and the 4th interval, is rotated the judgement of situation.

13. according to claim 10 to the stepping motor control circuit described in any one in 12, it is characterized in that,

When detect with drive current equidirectional surpass the induced current of predetermined value time, described rotation test section carries out and the rightabout faradic detection of described drive current after described the 2nd interval, is rotated the judgement of situation.

14. stepping motor control circuits according to claim 13, is characterized in that,

When detect with drive current equidirectional surpass the induced current of predetermined value time, described rotation test section, according to the faradic pattern detecting in 3 intervals, described the 1st interval to the, is rotated the judgement of situation.

15. stepping motor control circuits according to claim 1, is characterized in that,

In described the 1st interval, from the beginning in the 1st interval, be provided with the 5th interval of scheduled time width,

Described rotation test section is according to a plurality of induced currents that surpass pre-determined reference value whether detected in described the 5th interval, be selected in the described the 5th interval after interval faradic detection side to and detect, according to the described faradic pattern detecting in the interval based on after described the 5th interval and described the 5th interval, detect the rotary state of described stepping motor.

16. stepping motor control circuits according to claim 15, is characterized in that,

When a plurality of induced current over described pre-determined reference value not detected in described the 5th interval, described rotation test section is using described the 5th interval as described the 1st interval, in interval after described the 1st interval, detection side is detected to described induced current to being made as with the described the 1st interval identical direction, according to the described faradic pattern detecting in the interval based on after described the 1st interval and described the 1st interval, detect the rotary state of described stepping motor.

17. according to the stepping motor control circuit described in claim 15 or 16, it is characterized in that,

When a plurality of induced current over described pre-determined reference value being detected in described the 5th interval, described rotation test section using from finish in described the 5th interval till detect interval lower than the induced current of described fiducial value as the 6th interval, in interval after described the 6th interval, detection side is detected to described induced current to being made as with the described the 5th interval contrary direction, according to based in described the 5th interval, the 6th interval and other described faradic pattern detecting in interval, detect the rotary state of described stepping motor.

18. according to claim 15 to the stepping motor control circuit described in any one in 17, it is characterized in that,

When a plurality of induced current over described pre-determined reference value being detected in described the 5th interval, in the situation that from finish in described the 5th interval till detect the 7th interval scheduled time width that surpasses lower than the induced current of described fiducial value, in the interval of described rotation test section after described the 7th interval, detection side is detected to described induced current to being made as with the described the 5th interval contrary direction, according to based in described the 5th interval, the 7th interval and other described faradic pattern detecting in interval, detect the rotary state of described stepping motor.

19. stepping motor control circuits according to claim 18, is characterized in that,

Maintaining the grade of main driving pulse, drive under the state of described stepping motor, described the 5th interval and the 7th interval is the interval of rotary state of judging the initial positive direction of the described rotor in the 2nd quadrant in the space centered by the rotor of described stepping motor.

20. according to the stepping motor control circuit described in any one in claim 1 to 19, it is characterized in that,

Described rotation test section has described drive coil is flow through in detection each other in reverse direction faradic the 1st detecting element and the 2nd detecting element due to the free vibration of described stepping motor, and between described detection zone, by the drive coil that makes to comprise described stepping motor and the 1st closed circuit of described detecting element and the 2nd closed circuit being formed by described drive coil and low impedance element, repeatedly replace to detect described induced current, according to the faradic direction detecting, the detecting element that forms described the 1st closed circuit is switched to described the 1st detecting element or described the 2nd detecting element and detects.

21. 1 kinds of movements, is characterized in that, this movement has the stepping motor control circuit described in any one in claim 1 to 20.

22. 1 kinds of analog electronic clocks, is characterized in that, this analog electronic clock has the movement described in claim 21.